1.With channel DIN-switch to change channels 2.with fan 3.compatible with all our 5.8G VRX like RC305, RC805 , AIO goggles 5.8G 500mW AV Wireless Transmitter   Features of 5.8G 500mW AV Wireless Transmitter:With channel DIN-switch to change channels5.8G 500mw transmitter is powerful transmitter with fan,it is compatible with all our 5.8G VRX like RC305, RC805 , AIO goggles and 5.8G DVR DV01.Specificaitons of 5.8G 500mW AV Wireless Transmitter:Transmitter frequency:5645-5945MHz;8CHTransmitting Power:500mW/27dBmTransmitting distance:>5000m(open area)Frequency control:built-in frequency and phase lock loop  AV input:analog AV signal input ANT connector:SMA(inside the needle)power supply:6.5-15 voltsCurrent supply:400mASize:68*26*28mmWeight:65g(no cable and antenna) Remark:The transmitter's power input is ranging from 7-14V,however the voltage outptu from the TX for the camera us 0.5V,lower than the input power.It's suggested to use 3S lipo 11.1V battery.Note:antennas must be attched before powering on.