... use for headphone with microphone 4 in 1 nice appearance wireless headphone with good sound quality for FM,PC, ... receive the sound wirelessly from any electrical device with audio output such us TV,PC,DVD,VCD,MP3 ... cable4.Wired net chat:there will be audio cable with mic, insert it to the headphone and computer, ... DC 3V(2*1.5V AAA batteries) 12.Transmitter:DC 3V(2*1.5V AAA batteries) Packing:per carton ...