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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 The working frequency of the transmitter is ranged from 83-108MHZ The transmitter can be widely compatible with multi-media such as TV,PC,DVD,CD,VCD,MP3 and other electronic products with audio output plugs. Good quality of the sound and be effective with over 30M and the sound signal can penetrate barriers like walls and objects without the angle limitation. TV-Accompanying: You can enjoy the TV program freely without disturbing others by using wireless headphone. With super bass function. FM broadcast : The headphone can be used as FM radio separately and search and focus channels ranged from 88-108MHZ automatically with stable frequency. Online chat(Receiver can connect the audio line with microphone to the PC)Receiver with audio line can be used as wired headphone. Several headphones can share one transmitter The design conforms to human engineering principles comfortable for wearing Packaging: color box with blister inner Carton Dimension: 57*43*49cm Qty:20pcs N.W.:10.5kgG.W.:11.3kg