Xianghui wireless headphones expand and enhance your enjoyment of the audio source, such as TV, VCD, CD, PC, MP3/4. Parameters: 1. Frequency: 912.5-914.5MHz/863.1-863.5MHz 2. Frequenz:20Hz-20kHz 3. Distortion: <1% 4. S/N ration:>60db 5. Separation:>30db 6. Effective transmitting range: up to 300 feet