The machine has five main functions:1. Wireless Internet voice chat: transmitters and computer connections, wear can be accepted for freedom of movement within the room, truly wireless voice chat 2. Guardianship functions: transmitters be placed in infants, the elderly, the and other people in need of care side, the receiver can be used to listen to the voices of those being cared for easy care these are the same kind of products do not have the features. 3. FM radio: wireless headset receiver can listen to FM radio, electric tuner automatically find Desk, frequency stability. 4. Wireless headset: connect any audio output device 5. Wired headset features: direct by plane and accept links to a wired headset. High-fidelity sound, a beautiful sound, acceptable range of more than 10 meters. specification: Product name: TV wireless headset Battery usage: AAA battery (battery not included in delivery) Colour:Black Material:ABS Size:21X15X8.5CM Package Contents: 2 x headset 2 x audio cable 2 x transmitter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.