... channels wireless microphone(8*32channels),500-980MHz,distance :100M ,Tone-Lock MODEL: U-8, 8*32 Channels Wireless Conference Microphone(ACT ... voltage :DC-13.8V/1500mA Sensitivity of receiver selective switchS/N ratio:>105dBT. H. D distortion :<0.5%Frequency response :40Hz ... channels wireless microphone(8*32channels),500-980MHz,distance :100M ,Tone-Lock