5 in 1 wireless headphone Fm radio Wireless chat or wired headphone Monitor High sensitivity, interference resistance , strong singal, hi-fi for beautiful sound 10 m effective range Specifications: Transmitter: 1) transmission frequency: 86mhz 2) modulation mode: fm 3) transmission distance : up to 35 meters without interference Receiver (headphone) 1) frequency range: 84 ¿c 108mhz 2) reception mode: fm 3) distortion: ín 2% 4) power supply : 2^ aaa batteries( product color in silver, purple, red , black, green etc) According to your requirements