... at same time 2, Infrared manual frequency adjustment HT-8112L Wireless MicrophoneFeatures:1, Number of channels: 200 CH, Max available for ... -lock loop) technology, frequency stability∠±100Hz3, Infrared manual frequency adjustment4, Two channel R/L line independent output and line mixing output ... distance: 100 ~150 meters, depends on environmental conditions HT-8112L Wireless Microphone