The SIM800A modem has a SIM800A GSM chip and RS232 interface which enables easy connection with the computer or laptop using the USB to Serial connector or to the micro-controller using the RS232 to TTL converter.
SIM800A supports Quad-band 850/900/1800/1900 MHz, it can transmit Voice, SMS and data information with low power consumption.
 
SPECIFICATIONS
Input Voltage : 9V-12V DC.
Operating temperature: 40 – 85C.
Quad band 850/900/1800/1900MHz.
GPRS class 2/10.
Low power.
High Quality Product
5V interface for direct communication with MCU kit.
Configurable baud rate.
Built in SIM Card holder.
Built in Network Status LED.
Inbuilt Powerful TCP/IP protocol stack for internet data transfer over GPRS.