... function of A31 is supporting Wireless remote control, like 3G, GPRS, Internet communication. when plug 3G SIM card, then A31 works ... network,when plug 2G SIM card, then A31 works with GSM network. FOR MORE DETAILED 3G SOLUTION INSTRUCTIONS, PLEASE SEND EMAIL ... picture: led wireless controller for full color modules, supporting 3G, GPRS and Internet communication