1.500mW,up to 2km 2.used for Wireless telemetery charging for Parking,parking lot,electronic bus station 3.RS232/RS485/TTL Technical specification ... . High anti- interference and low BER(Bit error Rate)Based on the GFSK modulation mode, the high- efficiency forward error correction ... time for receiving and sending <10ms.ve 2 on-off input ports,2 on-off output ports ,user can control remotely terminal ...