SIM900 GSM

Specification:

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.