Features:
1) UHF wireless stereo headphone with 864MHz/915MHz ISM Band
2) Operation distance up to 100 meters with latest UHF/RF wireless technology
3) Several headphones can be used simultaneously with one transmitter
4) Built-in 40mm mylar speaker
5) Auto mute and auto tuning function available for headphone
6) Active noise reduction system for crystal clear sound
7) Double PLL system for ultimate frequency stability