description 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 88-108 mhz automatically with stable frequency 。 online chat oneline chat(receiver can connect the audio line with microphone to the pc)receiver with audio line can be used as wired headphone. the transmitter with six super blue led lights and also can be used as light separately in dark night.