V DTNF computer control USB cable SIM900A module SMS/MMS GSM GPRSS development board

Power supply:  
can through the USB power supply directly 
also can through DC005 power supply, 5V 1A or above 1A 

SIM card:spring type SIM socket

The antenna interface:external SMA antenna interface.

Light:3pcs 0603 red  indicator light to indicate RING(on power),PWR(power),NET(network)

Reset: have a reset button.

USB interface ,the board has a set of TTL level interface ,can communicate directly with 3.3 V and 2.85 V systems.

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