IR wireless headphone
Light weight headset for comfortable wearing.
Automatic muting design on receiving headphone.
FM system carrier frequency:2.8MHz right channel; 2.3MHz left channel .
Speaker: 40mm mylar.
cone Impedance: 32 ohms +/- 15%.
Effective range (maximum): about 10 meters.
Power source: batteries UM4 x 2 (optional).
Battery life: about 48 hours.