Feature: Wireless headset， wireless CD/PC/MP3 player， etc. The transmitter built-in MIC microphone Wireless Internet chat function Wireless monitoring function With FM radio A wired headset (receiver connected audio line when wired headset) USB charging (limited to transmitter， can choose， the price does not include the USB cable) Specification: Color : Black Transmitting frequency : 84~87MHz Power supply : AA DC 1.5v batteries 2pcs Receiving frequency : 84 ~ 108MHz Max receiving range : 30m FM radio frequency : 88~108MHz Power supply :2 * AAA 1.5v batteries Wireless headphone functions(Receive all-channel sound accompany from Computer， DVD， MP3， MP4 and other electronic porducts with audio output) Headset with FM radio functions Wired headphone functions Wired online chat Wired headphone Package included: 1 * 5 -in -1 wireless headphone 1 * Audio Cable 1 * Stander 1 * user manual