Protocol Wireless Headphones with TV, Stereo, MP3, FM radio and Microphone Transmitter Headphones syncs with transmitter no cord necessary Comfortable and lightweight with padded ear pieces - FM scan radio Transmitter connects to TV, stereo and MP3 devices - Built-in microphon for online chatting Transmitter doubles as headphone speaker Both headphones & transmitter takes (2) AAA batteries each - NOT INCLUDED