Product Features: 1.Wireless headphone functions 2.Headset with FM radio functions 3.Wired headphone functions Specifications Transmitter Transmitting frequency:84-87MHZ Power supply: AA DC 1.5v batteries 2pcs Receiver: Receiving frequency:84-108MHZ Max receiving frequency:30M FM radio frequency:88-108MHZ Power supply: AAA DC 1.5v batteries 2pcs