1. Dual band(900MHz/1800MHz) GSM/GPRS Modem with very advance SIM900/Sim900A GSM module.
2. The modem follows plug and play operation with on board RS232 interface for communication and follows standard AT command set.
3. Supply power: DC 9V to 12V
4. On board indicator LED & Buzzer for incoming message & call indication.
5. On board provision to select the power on of SIM900A
6. On board DB9 connector for connecting modem directly to computers serial port.
7. 3 pin male header (TTL)interface for connecting SIM900 directly with micro controller.
8. On board Audio (speaker and microphone) interface pins.
9. On board PWM and ADC channels(SIM900A PWM and ADCPINS)