Features: 1.Wireless headphone function 2.Wireless internet chating function 3.FM radio function 4.Supervision 5.Wired headphone function Transmitter: Transmitting frequency:85.5MHZ Power supply: 2 AAA DC 1.5v batteries Receiver Receiving frequency: 83-108MHZ Max receiving range: 30M FM radio frequency: 88-108MHZ Power supply: 2 AAA DC 1.5V batteries