... 4 In 1 Wireless Headphone for TV,PC, DVD,VCD,MP3/MP4 and CD player1,wireless listening function: It can receive the sound wirelessly from ... chat:there will be audio cable with mic, insert it to the headphone and computer, then you can chat.(Optional)1.System:VHF ... .Mode:Mono 4.Operation distance > 30meters(360 degree) 5.Signal-to-Noise Radio>50db 6.Distortion<2%THD 7.Speaker:40mm ...