... use. 1.5G/12CH/1500mW wireless AV transmitter and receiver ELP-WTR515 12CH 1500mW Wireless AV Transmitter*Transmit Power:1500mW. *Frequency:1.4G ... *14 mm.*Channel:12CH A/V frequency in-phase. *No obstructive Effective Range:1 ~ 3KM. *Package:12channels receiver, transmitter, 2antennas,TX cable,AV ...