Features:Small size and lightweight.Easy 8 channels for selection via the micro dip switches.Wireless transmission distance up to 800 meters without any obstacles and interfering signal( Actual transmission distance depends on specific environment).Ideal for FPV， wireless remote control aircraft， wireless remote control vehicle and so on.Specifications:Transmitter channel quantity: 8 channelsOutput impedance: 50ohmHigh Output Power: 29dBm (typical)Antenna connector: SMA (Inside the needle)Power supply voltage: 7-15VSupply current: 500mA @12VVideo band width: 0~8.0MHzAudio frequency: 6.5MHzVideo input level: 0.8~1.2Vp-pVideo input impedance: 75ohmAudio input level: 0.5~2.0Vp-pAudio input impedance: 10K / OhmWorking frequency: CH1:5705， CH2:5685， CH3:5665， CH4:5645， CH5:5885， CH6:5905， CH7:5925， CH8:5945Item size: 5.9 * 2.8 * 3.3cm / 2.4 * 1.1 * 1.3inItem weight: 43g / 1.5ozPackage size: 16 * 5.2 * 5.0cm / 6.4 * 2.1 * 2.0inPackage weight: 106g / 3.7ozPackage List:1 * TX51W Wireless Transmitter1 * 2dBi Antenna2 * AV Cable1 * DC Cable