Wireless FM modulator FM01

Light weight headset for comfortable wearing.
Automatic muting design on receiving headphones
FM system carrier frequency:
A channel:2.8MHz right channel; 2.3MHz left channel
B channel:3.8MHz right channel; 3.2MHz 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