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DollaTek SIMCOM SIM900 GSM GPRS Quad-Band Modules 2G Development Shield Board for R3 Mega with Antenna

Quad-Band 850/900/1800/1900 MHz - could work on GSM networks in all countries around the world, work with Uno Mega.
Embedded TCP / UDP stack - allows you to upload data to a Web server | RTC supported | selectable serial port | Jac speakers and headphones.
Note: This is a new version (64M version), SMS support MMS: Multimedia message and Short Message Service - so it is possible to send small amounts of data over the network (ASCII or raw hexadecimal).
The shield allows you to get SMS, MMS, GPRS and audio via UART by sending AT commands (GSM 07.07, 07.05 and SIMCOM enhanced to commands). The shield also has the 12 GPIOs, 2 PWMs and an ADC of the SIM900 module (They are all 2V8 logic) present on board..
Application: M2M (Machine 2 Machine) Applications.Remote control of appliances.Remote Weather Station or Wireless Sensor Network.Vehicle tracking system with a GPS module.Good to learn GSM / GPRS mobile phone development, control development of remote equipment, wireless meter reading, smart appliances, ultra long distance control, etc..

【4G LTE Wired GPS TRACKER 】: Vehicle GPS Tracking Device, Support 4G 3G 2G Network, GSM LTE WCDMA, Global Universal, Wide coverage, more stable....
【SOS Emergency Alarm】: If you encounter an emergency or dangerous situation while driving and you cannot make a call with your mobile phone, you....
【Power Off Alarm & Remote Cut off Oil】: If the theft found the tracker, as he get it off, you will receive a power off alarm on your phone. And If....
【REAL TIME TRACKING & GEO FENCE】: GPRS+GPS+BDS+LBS, Real-Time Positioning by Standard map, satellite map or Real map, accurately up to 10 meters.....
【SIM GPRS & FREE APP】: The GPS tracker needs a SIM card. SIM Card Not Included. Insert the SIM card in the tracker rightly, install it with the....

3G UMTS 850/1700/1900MHz GSM/GPRS/EDGE 850/900/1800/1900MHz.
5.5-inch screen with Corning Gorilla Glass 4.
Rear Camera: 8 MP with autofocus and LED flash Front Camera: 5 MP.
Internal memory storage Up to 16GB Expandable memory storage Up to 256GB Memory format microSD RAM 2GB.

The ThinkPad GOBI Mobile Broadband option is a wireless WAN-ready options that provide a cost-efficient remote access solution..
Also known as: Sierra Wireless AirPrime MC8355 HSPA/CDMA module (Gobi).
Frequency: 850MHz/900MHz/1800MHz/1900MHz/2100MHz.
Wireless Speed: EDGE: 247.4 kbps DL, 123.70 kbps UL, GPRS: 85.6 kbps DL, 42.8 kbps UL,GSM: 14.4 kbps UL/DL.

Fast battery charging app scan all high battery consumption services including Bluetooth, GPS, WiFi Connection, GPRS, Screen brightness, Screen timeout, NFC, Auto Sync etc..
You can stop all services on one screen using Fast Battery Charging app. It also show current health diagnostics of mobile battery..
This app not only reduce charging time but additionally elongates your battery time. To keep running battery charging in background press 'home' button..

Unlocked quad-band GSM cell phone compatible with 850/900/1800/1900 frequencies and US/International 3G compatibility via 850/900/1700/1900/2100 UMTS/HSDPA plus GPRS/EDGE capabilities.
3G-enabled smartphone in silver with 4-inch AMOLED touchscreen, slide-out QWERTY keyboard, and Symbian^3 operating system.
Up to 5 hours of talk time, up to 480 hours (20 days) of standby time.

Choice 1: USE as cell phone(Sim Card/ Memory Card needed, NOT included)/ Activated GSM 2G Micro Size Sim Card needed(for internet access, GPRS function also needed)/ Which Carrier's Sim Card is AVAILABLE for this watch? T-Mobile, Straight Talk, Lycamobile, Speedtalk, Ting GSM, Simple Mobile or ANY GSM carrier's 2G Sim Card is OK/ PLS NOTE: ALL carriers'(including AT&T, T-Mobile) 3G/4G/5G Sim Card is NOT AVAILABLE/ PLS NOTE: ALL CDMA carriers(Verizon, Sprint, Boost, PagePlus) is NOT available.
Phone function - Make phone call directly from the smart watch,including answering and dial-up.SIM slot,Single SIM card (micro SIM card) can be as a phone,support make calls by Bluetooth or smart watch.
GSM/GPRS 850/900/1800/1900(2G,not support CDMA).
Sync function(Only for Android) - Whatsapp,Twitter,Facebook,Browser(need put a 2G/2.5G network SIM card).
Sport health: sleep monitoring,sedentary remind. Other functions: Image viewer, Sound recorder (need put and SD card ), Remote capture, Alarm clock, Calendar,Camera (0.3M),Two way Anti-lost..
DON'T take to shower or Use in water(Little water on face such as small rain or Washing Hands is OK). Designed to charge by computer ....

Network type: GSM / GPRS 850/900/1800 / 1900MHz.
Entertainment: MP3, MP4, AVI format for local playback, Bluetooth music playback..
Simple pairing with your smartphone with the help of Bluetooth or NFC Connection. Magnetic charging to make your devices more safe in which someone is....
Compatible with most iOS and Android devices with multi-functions including sedentary reminder, sleep monitor, remote camera, music player, calendar,....

Access 3G or 4G networks and service bands that include LTE FDD, GSM/GPRS/edge or WCDMA/HSPA+ and roam across multiple networks around the world on a secure, private broadband connection..
Enjoy integrated personal navigation from the Built-in GPS..
Rest Easy with a One-year limited Warranty..

Multi Color Notification Lights / Eco-Modes to conserve battery life and also a new one touch Bright mode, when in dark areas.
5 Megapixel HD Camera (1932 × 2576 pixels max picture taking resolution).
HD Video Recording (1280 × 720 video capture in 720P resolution).
GSM GPRS EDGE 850, 900, 1800, 1900 MHz. UMTS HSDPA 800, 850, 1700, 2100 MHz. *Micro sim card*.

Cellular Protocol: GSM, CDMA, GPRS, UMTS, EDGE, HSDPA, WCDMA, HSUPA, HSPA+, LTE, DC-HSPA+.
Cellular Band: GSM 850/900/1800/1900 / UMTS 850/900/1800/1900/2100 / LTE 700/850/1700/1900/2100.