Wireless speaker: 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 10M and the sound signal can penetrate barriers like walls and objects without the angle limitation. FM broadcast: The transmitter can be used as FM radio separately and search and focus channels ranged from 88-108 MHz automatically with stable frequency with one earphone: You can enjoy the program freely without disturbing others by using the headphone. Technology Parameter Transmitter Working Frequency: 86.5MHz Transmit distance 10M Power supply 3 V Max working current 7.5MA Modulation: RF Receiver: Frequency 83.3-108.0MHz Division 23dB