Wireless Stereo Surround Sound hifi Rf Headphones for TV VCD PC MP3 MP4 CD DVD Ipod with 3.5mm to 2.5mm adapter w/transmitter Fm Online audio chat (built in Microphone at the transmitter) FM radio feature Operation distance up to 19M Receiving frequency: 85 ~ 108MHz Motile, portable, Use for TV, VCD, PC