Sim900 gprs gsm

Introduction GPRS Shield - EFCom is an ultra compact and reliable wireless module. This GPRS Shield is compatible with all boards which have the same form factor and pinout as a standard Ardu Board. EFCom is base on SIM900 4 Frequency GPRS module. The GPRS Shield is configured and controlled via its UART using simple AT commands. Just plug this shield on the Freadu board, you could easy to use AT command control EFCom Shild. You can use the 2 jumper block to connect the SIM900 URAT post to any pins within D0-D3for HardwareSoftware serial port. There is a switch on board, you can use it to select the connection of the UART port or Debug port,but by the switch and jumper block, the SIM900 can be connect to PC via FT233RL. Packing list 1 x GPRS Shield -EFCom 1 x 4 Frequency Antenna 1 x9V ACDC Power Adapter

introduction: gprs shield efcom is an ultra compact and reliable wireless module. this gprs shield is compatible with all boards which have the same form factor and pinout as a standard ardu board. efcom is base on sim frequency gprs module. the gprs shield is configured and controlled via its uart using simple at commands. just plug this shield on the freadu board, you could easy to use at command control efcom shild. you can use the 2 jumper block to connect the sim900 urat post to any pins within d0 d3 for hardware software serial port. there is a switch on board, you can use it to select the connection of the uart port or debug port,but by the switch and jumper block, the sim900 can be connect to pc via ft233rl. packing list: 1 x gprs shield efcom 1 x 4 frequency antenna 1 x9v ac dc power adapter " Box Pack - No Warranty

GSM Internet HSDPA 7.2Mbusb modem Avalibal in all Pakistan Pakistan Wireless Internet USB Coverage. New Smart USB Stick user can access wireless Internet at any time and at any place Through’s HSDPA/UMTS/ EDGE/GPRS Network largest coverage available any Mobil operator’s Sim Zong, Mobilink, Warid, Telenor and Ufone throughout All Pakistan & World wide.Works at more than Cities towns villages and highways across pakistan coverage in Pakistan. LARGEST INTERNET DATA COVERAGE ALL PAKISTAN: Where other Internet networks fail, ours connects instantly. On highways & byways, throughout thousands of destinations across Pakistan, any Mobil sim network avaliable has you fully covered. services youcan enjoy a great internet browsing experience. Download email or data faster than ever before. 3G HIGH SPEED WIRELESS INTERNET USB MODEM STICK: This USB 2G/3G & 4G Technology all world wide Wireless network support USB is an ideal high speed wireless data communication device for business and home usage specially suitable for people on the move or at places where traditional internet connectivity links are not available. user can access wireless Internet at any time and at any place through’s any mobil operators’ Network internet connectivity available all Pakistan and world wide Services ownload email or data faster than ever before. Features: Compatible: with 2G / 3G / 4G Networks Supports SIM: Zong / Mobilink / Warid / Telenor / Ufone Protocol: HSDPA / HSUPA / UMTS / EDGE / GPRS / GSM Benefits: Statistics showing uplink and downlink with every passing moment Works on laptops, desktops & tablets (USB port required) Works countrywide – buy anywhere, use anywhere Works in load shedding no power access required Complete visibility of usage & billing details Available in prepaid & postpaid Sims Operating systems: Zero Cd Plug and play installation all operating systems wonderful Smart USB Stick Windows Windows XP Windows Vista Window 7 Linux Mac Contact: Box Pack - No Warranty

3G HIGH SPEED WIRELESS INTERNET USB MODEM STICK: This USB 2G/3G & 4G Technology all world wide Wireless network support USB is an ideal high speed wireless data communication device for business and home usage specially suitable for people on the move or at places where traditional internet connectivity links are not available. user can access wireless Internet at any time and at any place through’s any mobil operators’ Network internet connectivity available all Pakistan and world wide Services you can enjoy a great internet browsing experience Download email or data faster than ever before. Pakistan Wireless Internet USB Coverage. New Smart USB Stick user can access wireless Internet at any time and at any place Through’s HSDPA/UMTS/ EDGE/GPRS Network largest coverage available any Mobil operator’s Sim Zong, Mobilink, Warid, Telenor and Ufone throughout All Pakistan & World wide.Works at more than Cities towns villages and highways across pakistan coverage in Pakistan. LARGEST INTERNET DATA COVERAGE ALL PAKISTAN: Where other Internet networks fail, ours connects instantly. On highways & byways, throughout thousands of destinations across Pakistan, any Mobil sim network avaliable has you fully covered. services youcan enjoy a great internet browsing experience. Download email or data faster than ever before. Features: USB: Stylish body dimensions Antenna: omni High Power Built in Compatible: with 2G / 3G / 4G Networks Frequency: Mhz Supports SIM: Zong / Mobilink / Warid / Telenor / Ufone Protocol: HSDPA / HSUPA / UMTS / EDGE / GPRS / GSM Data rates: upto 7.2 Mbps on 3G networks. Great value for IR subscribers Benefits: Statistics showing uplink and downlink with every passing moment Works on laptops, desktops & tablets (USB port required) Works countrywide – buy anywhere, use anywhere Works in load shedding no power access required Complete visibility of usage & billing details Available in prepaid & postpaid Sims Operating systems: Zero Cd Plug and play installation all operating systems wonderful Smart USB Stick Windows Windows XP Windows Vista Window 7 Linux Mac Prise: Contact: Mobile: Avalibal in all Pakistan Box Pack - No Warranty

3G HIGH SPEED WIRELESS INTERNET USB MODEM STICK: This USB 2G/3G & 4G Technology all world wide Wireless network support USB is an ideal high speed wireless data communication device for business and home usage specially suitable for people on the move or at places where traditional internet connectivity links are not available. user can access wireless Internet at any time and at any place through’s any mobil operators’ Network internet connectivity available all Pakistan and world wide Services you can enjoy a great internet browsing experience Download email or data faster than ever before. Pakistan Wireless Internet USB Coverage. New Smart USB Stick user can access wireless Internet at any time and at any place Through’s HSDPA/UMTS/ EDGE/GPRS Network largest coverage available any Mobil operator’s Sim Zong, Mobilink, Warid, Telenor and Ufone throughout All Pakistan & World wide.Works at more than Cities towns villages and highways across pakistan coverage in Pakistan. LARGEST INTERNET DATA COVERAGE ALL PAKISTAN: Where other Internet networks fail, ours connects instantly. On highways & byways, throughout thousands of destinations across Pakistan, any Mobil sim network avaliable has you fully covered. services youcan enjoy a great internet browsing experience. Download email or data faster than ever before. Features: USB: Stylish body dimensions Antenna: omni High Power Built in Compatible: with 2G / 3G / 4G Networks Frequency: Mhz Supports SIM: Zong / Mobilink / Warid / Telenor / Ufone Protocol: HSDPA / HSUPA / UMTS / EDGE / GPRS / GSM Data rates: upto 7.2 Mbps on 3G networks. Great value for IR subscribers Benefits: Statistics showing uplink and downlink with every passing moment Works on laptops, desktops & tablets (USB port required) Works countrywide – buy anywhere, use anywhere Works in load shedding no power access required Complete visibility of usage & billing details Available in prepaid & postpaid Sims Operating systems: Zero Cd Plug and play installation all operating systems wonderful Smart USB Stick Windows Windows XP Windows Vista Window 7 Linux Mac Prise: Contact: Mobile: Avalibal in all Pakistan

Contact Person: Mr.Shaukat Ali Khan Cell: - Good speed for reasonable price. Connect your PC to the internet without telephone line. Manage your business in real-time! Send and receive e-mails! Browse WEB database! Access VPN! Send SMS messages from your PC! Use VoIP feature! Teltonika ModemPCI G10 provides global wireless access to the Internet and e-mail and on GPRS (General Packet Radio Service) capable GSM networks. With download speeds up to 80 kbps and upload 20 kbps, you will have an access to wireless connectivity similar to DSL or cable modems. With the help of this device, you are able to log on to the Internet anywhere and everywhere. Teltonika ModemPCI G10 connects to the PC through PCI interface, which is very speedy and convenient. The modem takes the DC power directly from the PCI interface, so no charging device or external AC/DC adapter is required. We are working with the most advanced and suitable wireless bearers nowadays and looking forward to use them for our future products as far as they are reliable and suitable for customer needs. You will achieve much higher speeds with Teltonika ModemPCI G10 than with ordinary dial-up modem. Main features: The data type and data transfer speed depends on the service provided by your GSM operator. ModemPCI G10 supports the following data-bearers: CSD Up to 9.6 kbps GPRS Quad Band GPRS modem Mhz. Capacity class 4 (2W) MHz waves. Capacity class 1 (1W) MHz waves. GPRS class 10. GPRS CS1 – CS4. Terminal Equipment Interfaces PCI – UART bridge speed 1Mbps. AT interface with standard modem emulation. Operating Systems supported: Windows /XP/XP Pro/Linux. Features on demand External system reset by SMS. Box Pack- Warranty: 1 Year

This product supports Quad-band GSM network and GPRS, and can switch seamlessly between different networks. Use Standard GSM SIM card (Not included, not work for CDMA or 3G network, but 3G SIM card which work for GSM network is ok) Features: Operation Frequency: Quad-band (GSM MHz) Real time monitoring/separate recording/MMS monitoring surveillance device Compact design, stable performance, beautiful and practical Automatic answer function An indispensable utility products for family, education, healthy living Support TF card up to 8GB (not including) Charger Input: ACV Hz Charger Output: DC 5V 300mA-500mA Internal Battery: 3.7V 450mA Rechargeable Li-ion battery Camera sensor type: CMOS Camera pixel: 2 million Support system: Win 7 / XP / / Vista Standby time: about 10 to 15 hours; working time is about 1 to 2 hours. Realtime Remote Listening in call to X009 OR X009 call user automatically. Realtime taking picture and send back to user via MMS. Remote Control Camera for start/stop video recording. Auto Reminder when the voice is over 60dB. Positioning information / real time tracking. Function Operation: Power on: Press and hold the On/Off key for 3-5 seconds. The indicator light flashes continuously, which means the product is switched on. After the indicator goes out, calls can be made. Press and hold the On/Off key for 3-5 seconds. The indicator light keeps on. And later, it goes out, which means the product is switched off. Photo Shooting: Write SMS “000” and send to the product. A photo will be automatically taken and saved in the TF card. Photo Shooting and Sending Back: Edit the SMS “111” and send to the product (A card with GPRS and colored SMS is required for this function.) Video Recording: Write SMS “222” and send to the product (Send “444” during video recording will end the process and save to the TF card.) Audio Recording: Write SMS “333” and send to the product (Send “444” during audio recording will end the process and save to the TF card.). Memory Card Formatting: Write SMS “999” and send to the product, the memory card will be formatted. Sound Control Callback: 1. Message Callback: The authorized person edits the SMS “777” and send to the product. When the sound around the product exceeds 30 dB, there will be a Chinese SMS “Safety tips: Someone broke into secretly” replied to the authorized person. 2. Phone Callback: The authorized person edits the SMS “888” and send to the product. When the sound around the product exceeds 30 dB, there will be a direct dial-back to the mobile phone of the authorized person. Battery Status: Remarks: With default setting of this product, the last SMS instruction will automatically cancel the previous SMS instruction. For ending the operation of all of the above functions, please edit the SMS“444” and send to the product. Positioning Information: User is expected to receive a positioning information after sending "DW" code to the machine through SMS. Both cellphone and computer can be used to click the link and check the specific location. Send"SOS+SOS number" to the product throug"

Includes antenna and battery in package.New only used once in academic project. Battery (free) 4V, mAh. Antenna wire length 2m Features 1) Quad-Band MHz - would work on GSM networks in all countries across the world. 2) GPRS multi-slot class ) GPRS mobile station class B 4) Compliant to GSM phase 2/2+ 5) Class 4 (2 W at MHz) 6) Class 1 (1 W at MHz) 7) Control via AT commands - Standard Commands: GSM | Enhanced Commands: SIMCOM AT Commands. 8) Short Message Service - so that you can send small amounts of data over the network (ASCII or raw hexadecimal). 9)Embedded TCP/UDP stack - allows you to upload data to a web server. 10) RTC supported. 11) Low power consumption - 1.5mA(sleep mode) 12) Industrial Temperature Range - -40°C to +85 °C datasheets can be provided.

Dear All, I am selling this device very use full for the desired operations. only serious buyers can contact on - Type: Office Electronics Type: Access Control System Teltonika Handheld GPS/GPRS Tracker GH with Man Down function (TELTONIKA GH) Home care. Children, old people, pets etc. tracking and personal security. Security. GeoFence function, emergency calls (Business. Employees, cars, goods real-time tracking and protection, command and control from Monitoring Center. Protect your children! Take care of your pets! Search and rescue (SAR)! Protect your rental devices! Manage and secure your fleet and workforce! Combination of GPS and GSM wireless networks. Device configuration by SMS or from PC. Real-Time tracking from the Internet. Low Battery notification by SMS. USB GSM Modem function. Advantages: Man down function: movement sensor for fall detection and power saving Alarm button for voice and data transmission Voice calls Loudspeaker Polygonal Geofence zones Parking function Silent call Modem emulation Remote control by SMS ENJOY POCKET-SIZE AND LIGHT-WEIGHT! Teltonika HandHeld Tracker is a handheld terminal with GSM and GPS connectivity, which is able to get device coordinates and transfer them via GSM network. No installation is required. This device is perfectly suitable for applications where location acquirement of remote objects is needed and perfectly suites for securing company's assets. Small size, long lifetime, mobility and universal configuration of the device ensures wide spectrum of its application: from people tracking, track control to special or secret tasks. GeoFence function allows to set restricted goegraphic areas and device will send warning messages whenever the object crosses the zone (in or out). Device can be used as USB GSM modem. High GPS receiver sensitivity makes device easy to integrate in any environment where ordinary GPS receivers can not fix their position. The whole of the mentioned advantages makes this solution very attractive for companies which success depends on quality of transportation, logistics and movable object monitoring. What you get: Combination of GPS and GSM wireless networks. Device configuration by SMS or from PC. Secure property via Geofence Protection. Real-Time tracking from the Internet. Device works in Sleep, Logging and Alarm modes. Low Battery notification by SMS. USB GSM Modem function. Package contents: GH Handheld Tracker USB-Cable Battery User Manual 220V Charger Specification GH Specifications: Box Pack - No Warranty

Dear All, I am selling this device very use full for the desired operations. only serious buyers can contact on - Type: Office Electronics Type: Access Control System Teltonika Handheld GPS/GPRS Tracker GH with Man Down function (TELTONIKA GH) Home care. Children, old people, pets etc. tracking and personal security. Security. GeoFence function, emergency calls (Business. Employees, cars, goods real-time tracking and protection, command and control from Monitoring Center. Protect your children! Take care of your pets! Search and rescue (SAR)! Protect your rental devices! Manage and secure your fleet and workforce! Combination of GPS and GSM wireless networks. Device configuration by SMS or from PC. Real-Time tracking from the Internet. Low Battery notification by SMS. USB GSM Modem function. Advantages: Man down function: movement sensor for fall detection and power saving Alarm button for voice and data transmission Voice calls Loudspeaker Polygonal Geofence zones Parking function Silent call Modem emulation Remote control by SMS ENJOY POCKET-SIZE AND LIGHT-WEIGHT! Teltonika HandHeld Tracker is a handheld terminal with GSM and GPS connectivity, which is able to get device coordinates and transfer them via GSM network. No installation is required. This device is perfectly suitable for applications where location acquirement of remote objects is needed and perfectly suites for securing company's assets. Small size, long lifetime, mobility and universal configuration of the device ensures wide spectrum of its application: from people tracking, track control to special or secret tasks. GeoFence function allows to set restricted goegraphic areas and device will send warning messages whenever the object crosses the zone (in or out). Device can be used as USB GSM modem. High GPS receiver sensitivity makes device easy to integrate in any environment where ordinary GPS receivers can not fix their position. The whole of the mentioned advantages makes this solution very attractive for companies which success depends on quality of transportation, logistics and movable object monitoring. What you get: Combination of GPS and GSM wireless networks. Device configuration by SMS or from PC. Secure property via Geofence Protection. Real-Time tracking from the Internet. Device works in Sleep, Logging and Alarm modes. Low Battery notification by SMS. USB GSM Modem function. Package contents: GH Handheld Tracker USB-Cable Battery User Manual 220V Charger Specification GH Specifications

Dear All, I am selling this device very use full for the desired operations. only serious buyers can contact on - Type: Office Electronics Type: Access Control System Teltonika Handheld GPS/GPRS Tracker GH with Man Down function (TELTONIKA GH) Home care. Children, old people, pets etc. tracking and personal security. Security. GeoFence function, emergency calls (Business. Employees, cars, goods real-time tracking and protection, command and control from Monitoring Center. Protect your children! Take care of your pets! Search and rescue (SAR)! Protect your rental devices! Manage and secure your fleet and workforce! Combination of GPS and GSM wireless networks. Device configuration by SMS or from PC. Real-Time tracking from the Internet. Low Battery notification by SMS. USB GSM Modem function. Advantages: Man down function: movement sensor for fall detection and power saving Alarm button for voice and data transmission Voice calls Loudspeaker Polygonal Geofence zones Parking function Silent call Modem emulation Remote control by SMS ENJOY POCKET-SIZE AND LIGHT-WEIGHT! Teltonika HandHeld Tracker is a handheld terminal with GSM and GPS connectivity, which is able to get device coordinates and transfer them via GSM network. No installation is required. This device is perfectly suitable for applications where location acquirement of remote objects is needed and perfectly suites for securing company's assets. Small size, long lifetime, mobility and universal configuration of the device ensures wide spectrum of its application: from people tracking, track control to special or secret tasks. GeoFence function allows to set restricted goegraphic areas and device will send warning messages whenever the object crosses the zone (in or out). Device can be used as USB GSM modem. High GPS receiver sensitivity makes device easy to integrate in any environment where ordinary GPS receivers can not fix their position. The whole of the mentioned advantages makes this solution very attractive for companies which success depends on quality of transportation, logistics and movable object monitoring. What you get: Combination of GPS and GSM wireless networks. Device configuration by SMS or from PC. Secure property via Geofence Protection. Real-Time tracking from the Internet. Device works in Sleep, Logging and Alarm modes. Low Battery notification by SMS. USB GSM Modem function. Package contents: GH Handheld Tracker USB-Cable Battery User Manual 220V Charger Specification GH Specifications Box Pack - No Warranty

Dear All, I am selling this device very use full for the desired operations. only serious buyers can contact on - Type: Office Electronics Type: Access Control System Teltonika Handheld GPS/GPRS Tracker GH with Man Down function (TELTONIKA GH) Home care. Children, old people, pets etc. tracking and personal security. Security. GeoFence function, emergency calls (Business. Employees, cars, goods real-time tracking and protection, command and control from Monitoring Center. Protect your children! Take care of your pets! Search and rescue (SAR)! Protect your rental devices! Manage and secure your fleet and workforce! Combination of GPS and GSM wireless networks. Device configuration by SMS or from PC. Real-Time tracking from the Internet. Low Battery notification by SMS. USB GSM Modem function. Advantages: Man down function: movement sensor for fall detection and power saving Alarm button for voice and data transmission Voice calls Loudspeaker Polygonal Geofence zones Parking function Silent call Modem emulation Remote control by SMS ENJOY POCKET-SIZE AND LIGHT-WEIGHT! Teltonika HandHeld Tracker is a handheld terminal with GSM and GPS connectivity, which is able to get device coordinates and transfer them via GSM network. No installation is required. This device is perfectly suitable for applications where location acquirement of remote objects is needed and perfectly suites for securing company's assets. Small size, long lifetime, mobility and universal configuration of the device ensures wide spectrum of its application: from people tracking, track control to special or secret tasks. GeoFence function allows to set restricted goegraphic areas and device will send warning messages whenever the object crosses the zone (in or out). Device can be used as USB GSM modem. High GPS receiver sensitivity makes device easy to integrate in any environment where ordinary GPS receivers can not fix their position. The whole of the mentioned advantages makes this solution very attractive for companies which success depends on quality of transportation, logistics and movable object monitoring. What you get: Combination of GPS and GSM wireless networks. Device configuration by SMS or from PC. Secure property via Geofence Protection. Real-Time tracking from the Internet. Device works in Sleep, Logging and Alarm modes. Low Battery notification by SMS. USB GSM Modem function. Package contents: GH Handheld Tracker USB-Cable Battery User Manual 220V Charger Box Pack - No Warranty

Dear All, I am selling this device very use full for the desired operations. only serious buyers can contact on - Type: Office Electronics Type: Access Control System Teltonika Handheld GPS/GPRS Tracker GH with Man Down function (TELTONIKA GH) Home care. Children, old people, pets etc. tracking and personal security. Security. GeoFence function, emergency calls (Business. Employees, cars, goods real-time tracking and protection, command and control from Monitoring Center. Protect your children! Take care of your pets! Search and rescue (SAR)! Protect your rental devices! Manage and secure your fleet and workforce! Combination of GPS and GSM wireless networks. Device configuration by SMS or from PC. Real-Time tracking from the Internet. Low Battery notification by SMS. USB GSM Modem function. Advantages: Man down function: movement sensor for fall detection and power saving Alarm button for voice and data transmission Voice calls Loudspeaker Polygonal Geofence zones Parking function Silent call Modem emulation Remote control by SMS ENJOY POCKET-SIZE AND LIGHT-WEIGHT! Teltonika HandHeld Tracker is a handheld terminal with GSM and GPS connectivity, which is able to get device coordinates and transfer them via GSM network. No installation is required. This device is perfectly suitable for applications where location acquirement of remote objects is needed and perfectly suites for securing company's assets. Small size, long lifetime, mobility and universal configuration of the device ensures wide spectrum of its application: from people tracking, track control to special or secret tasks. GeoFence function allows to set restricted goegraphic areas and device will send warning messages whenever the object crosses the zone (in or out). Device can be used as USB GSM modem. High GPS receiver sensitivity makes device easy to integrate in any environment where ordinary GPS receivers can not fix their position. The whole of the mentioned advantages makes this solution very attractive for companies which success depends on quality of transportation, logistics and movable object monitoring. What you get: Combination of GPS and GSM wireless networks. Device configuration by SMS or from PC. Secure property via Geofence Protection. Real-Time tracking from the Internet. Device works in Sleep, Logging and Alarm modes. Low Battery notification by SMS. USB GSM Modem function. Package contents: GH Handheld Tracker USB-Cable Battery User Manual 220V Charger

  Dear All, I am selling this device very use full for the desired operations. only serious buyers can contact on Type: Office Electronics Type: Access Control System Teltonika Handheld GPS/GPRS Tracker GH3000 with Man Down function (TELTONIKA GH3000) Home care. Children, old people, pets etc. tracking and personal security. Security. GeoFence function, emergency calls (Business. Employees, cars, goods real-time tracking and protection, command and control from Monitoring Center. Protect your children! Take care of your pets! Search and rescue (SAR)! Protect your rental devices! Manage and secure your fleet and workforce! Combination of GPS and GSM wireless networks. Device configuration by SMS or from PC. Real-Time tracking from the Internet. Low Battery notification by SMS. USB GSM Modem function. Advantages: Man down function: movement sensor for fall detection and power saving Alarm button for voice and data transmission Voice calls Loudspeaker Polygonal Geofence zones Parking function Silent call Modem emulation Remote control by SMS ENJOY POCKET-SIZE AND LIGHT-WEIGHT! Teltonika HandHeld Tracker is a handheld terminal with GSM and GPS connectivity, which is able to get device coordinates and transfer them via GSM network. No installation is required. This device is perfectly suitable for applications where location acquirement of remote objects is needed and perfectly suites for securing company's assets. Small size, long lifetime, mobility and universal configuration of the device ensures wide spectrum of its application: from people tracking, track control to special or secret tasks. GeoFence function allows to set restricted goegraphic areas and device will send warning messages whenever the object crosses the zone (in or out). Device can be used as USB GSM modem. High GPS receiver sensitivity makes device easy to integrate in any environment where ordinary GPS receivers can not fix their position. The whole of the mentioned advantages makes this solution very attractive for companies which success depends on quality of transportation, logistics and movable object monitoring. What you get: Combination of GPS and GSM wireless networks. Device configuration by SMS or from PC. Secure property via Geofence Protection. Real-Time tracking from the Internet. Device works in Sleep, Logging and Alarm modes. Low Battery notification by SMS. USB GSM Modem function. Package contents: GH3000 Handheld Tracker USB-Cable Battery User Manual 220V Charger

product supports the a the GSM：850/900/1800/1900 network and GPRS standard quad-band, and can switch seamlessly between different networks. Compact; signal strength; voice; precise positioning; stable performance; the long standby。 Power on: Open the back cover, the SIM card inserted into the card holder automatically boot until the indicator goes off, you can use Monitoring to detect: normal boot, when necessary monitoring tools can dial the dial is turned to hear the status of the location around 10 meters Voice Callback:Phone open: with fixed-line or mobile phone SIM card number to get through the alarm hear ambient sound 2-3 seconds, hang up that set successfully, the default alarm status.(35 decibels of sound when the alarm within 4 meters, the alarm will automatically dial the number set). Positioning: Send SZHM # authorized person phone number # to the alarm, set the authorized person Tip: Send SZHM # authorized person phone number # to the product do not reply to successfully set the new guardian list before sending SC , etc. SMS Reply (deleted guardian list success), recurrence SZHM # authorized person phone number