The 5.8GHz provides high quality audio. Record audio up to 30 meters away with no obstacle. Automatic channel switch programme to avoid interference from multiple systems in the same environment. With three discrete channel groups. One receiver can work with up to three transmitters simultanously. Line & Mic inputs provide wide range of input options. Real-time headphone monitor jack. Detachable and flexible antenna can be rotated 360°accordingly for best sound. Rechargeable li-ion battery (included). RF power: 15dBm(30mW) RF frequence: 5725-5875MHz Channels: 3CH, RX channel changeable, TX follow with RX Transmission distance: 30m with no obstacle Interface: Transmitter Mic in: Max 160mV/-13dBu, 1.8V phantom power Transmitter Line in: Max 2V/8dBu, 50V DC isolation Receiver Phone out: Max 70mW/32Ω, 10V DC isolation Receiver Line out: 4 times mic in gain, 50V DC isolation Receive sensitivity: 98dB THD+N: -92dB Sample rate: 48K/16bit Audio frequence response: 40Hz-18KHz/±1dB Voice delay: 18ms Power consumption: RX: 180mA/6V TX: 140mA/6V Antenna gain: 3dBi Weight: 810g Battery: 7.2V/1000mAh Li-ion Battery type: LP-E17(CANON EOS M3/750D/760D) Dimensions: RX: 113x64x28mm; TX: 113x64x28mm Operating temperature: 0°C-50°C Storage temperature: -20°C-55°C