... PLL eight channels wireless microphone(8*32channels),500-980MHz,distance :100M ,Tone-Lock MODEL: U-8, 8*32 Channels Wireless Conference ... conference transmitter )at the same time without interferenceFrequency stability :<±10ppmOperating range :>105dBT.H. D distortion :<0.5%Frequency response :40Hz -18KHzAudio ... PLL eight channels wireless microphone(8*32channels),500-980MHz,distance :100M ,Tone-Lock