SIM900 Wireless GSM/GPRS Module with Antenna

Quad-Band 850 / 900/ 1800 / 1900 MHz – would work on GSM networks in all countries across the world.
GPRS multi-slot class 10/8
GPRS mobile station class B
Compliant to GSM phase 2/2+
Class 4 (2 W @ 850 / 900 MHz)
Class 1 (1 W @ 1800 / 1900MHz)
Control via AT commands – Standard Commands: GSM 07.07 & 07.05 | Enhanced   Commands: SIMCOM AT Commands.
Short Message Service – so that you can send small amounts of data over the network   (ASCII or raw hexadecimal).
Embedded TCP/UDP stack – allows you to upload data to a web server.
RTC supported.
Selectable serial port.
Speaker and Headphone jacks.
Low power consumption – 1.5mA(sleep mode)
Industrial Temperature Range:  -40°C ~ +85 °C
Application:
M2M (Machine 2 Machine) Applications.
Remote control of appliances.
Remote Weather station or a Wireless Sensor Network.
Vehicle Tracking System with a GPS module.