... .2G1.3G *Dimension:53*41*14mm *No obstructive Effective Range:800~1500meters Product Description8CH 400mW Wireless AV Transmitter *Transmit power:400mW ... . *Channel:8CH AV frequency in-phase. *No obstructive Effective Range:800~1500meters. *Package:12CH receiver,transmitter,2antennas,TX cable,AV cable ... accessory etc. 8ch 400mW wireless audio and vedio transmitter with 800~1500meters effective range