Features :

- The Siemens SIM900B is a standard AT commands based GSM module, it support GPRS communication.
- The SIM900B module is AT command controlled GSM modem, via serial port RS232 TTL communication.
- Frequency bands: 900MHz ,1800MHz,1900MHz.
- Program source code would be provided so that buyers can use the module easily and get familiar with the module quickly.
- Standard SMA interface.
- Common applications are sending or receiving SMS GPRS control, phone calling.
- Power supply: DC 5V.

From the picture you can see:

- Simcom 900b module interface.
- Sim card interface.
- Handset interface.
- Download switch, turn on or off download function.
- Vbat switch, switch the voltage source from the adaptor or external battery.
- Pwrkey key, turn on or turn off SIM900B.
- Buzzer.
- Expand port, such as keypad port, main and debug serial port, display port.
- Main serial port for downloading, AT command transmitting, data exchanging.
- Debug serial port.
- Hole for fixing the antenna.
- Source adapter interface.
- Light.
- Hole for fixing the SIM900B.
- Hand phones interface.

Packages contents:

Power adapter, RS232 cable, GSM antenna, Simcom 900B modules, antenna connector with wire, headset and CD.

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