Evergreen's GSM/GPRS TTL UART Modem is built with Dual Band GSM/GPRS engine- SIM900A, works on frequencies 900/ 1800 MHz. The Modem comes with onboard voltage level converter for UART communication, which allows you to connect 5V & 3V3 microcontroller directly without any level conversion chips. The baud rate is configurable from 9600-115200 through AT commands. The GSM/GPRS Modem has an internal TCP/IP stack to enable you to connect with internet via GPRS. It is suitable for SMS, Voice as well as DATA transfer application in M2M interface. Using this modem,you can make audio calls, SMS, Read SMS, attend the incoming calls and internet ect through simple AT commands. The modem uses MIC29302 voltage regulator, which enables a wide range of operating voltage (5.5V to 12V) and current rating of 2 Amps.