Description:1) UHF wireless stereo headphone with 915MHz ISM Band2) Operation distance up to 100 meters with latest UHF/RF wireless technology3) Several headphones can be used simultaneously with one transmitter4) Built-in 40mm mylar speaker5) Auto mute and auto tuning function available for headphone6) Active noise reduction system for crystal clear sound7) Double PLL system for ultimate frequency stabilitySpecifications:1) System: UHF/RF2) Carrier frequency: 914, 914.5, 915 MHz3) Modulation: FM4) Mode: stereo5) Transmit power: 10mW(maximum)6) S/N ratio: 75dB(minimum)7) Channel separation: 35dB(minimum)8) Distortion: 1%(maximum)9) Frequency response: 30 - 20,000Hz10) Power supply of transmitter: DC12V 150mA11) Power supply of headphone: 2 AAA batteriesAccessories:1) Audio Cable2) \"Y\" Cable3) Switching Adapter4) Instruction Manual5) Guarantee Letter