SIM900A RS232 for PC or TTL microcontroller interface with DTMF active feature. The GSM/GPRS Cellular Module for Microcontrolles/ Embedded Systems/ Home automation is complete in all respect ready to plug-in interface for your microcontroller(Arduino,Raspberry pi, Atmega, PIC, Basic Stamp, 8051, AVR etc) with an SIM900A GSM/GPRS cellular module. This allows you to easily add SMS, GSM/GPRS, and TCP/IP functionalities to your microcontroller based project. Dual Mode fuctionality - connect with RS232 serial port for direct PC interface or through TTL I/O interface for microcontroller based autonoumous projects.
All you need to add cellular functionality to your project is a SIM card (pre-paid or straight from your phone) and you can start sending Serial messages to make calls, send texts and serve web pages!

GSM/GPRS module is a breakout board and system of SIM900 Quad-band GSM/GPRS module. It can communicate with controllers via AT commands (GSM 07.07 ,07.05 and SIMCOM enhanced AT Commands). This module support software power on and reset.
Features

    Dual-Band 900/ 1800 MHz
    GPRS multi-slot class 10/8GPRS mobile station class B
    Compliant to GSM phase 2/2+Class 4 (2 W @ 900 MHz)
    Class 1 (1 W @ 1800MHz)
    Control via AT commands (GSM 07.07 ,07.05 and SIMCOM enhanced AT Commands)
    Low power consumption: 1.5mA(sleep mode)
    Operation temperature: -40°C to +85 °C
    Compatible with any microcontroller -  Arduino, Raspberry PI ,Basic Stamp, Propeller, ATmega, 8051, PIC , AVR, dsPIC, MSP430