Product Features: 1.Wireless headphone functions 2.Headset with FM radio functions 3.Wired headphone functions 4.Wired online chat Specifications Transmitter: Transmitting frequency:84-87MHZ Power supply:AA DC 1.5v batteries 2pcs Receiver Receiving frequency:84-108MHZ Max receiving range:30M FM radio frequency:88-108MHZ Power supply:AAA DC 1.5v batteries 2pcs