GSM SIM900A USB Sheild
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more images. . . <hovergallery maxhoverwidth=600 maxhoverheight=600> File:GSM SIM900A.jpg

Specifications

GSM/GPRS Module: SIMCOM SIM900A
On board Interfaces
- USB (usb to serial using CP2102)
- RS232 with MAX232
- TTL pin breakout (RXD,TXD,GND)