*    Infrared wireless stereo headphone for car audio systems
*    Single channel for one car audio source
*    Compatible with all vehicle AV applications
*    Auto mute and auto power off function available for headphones
*    Effective range up to 10 meters
*    Ultralight weight design for comfortable wearing with adjustalbe headband
*    Numbers of headphones can be used simultaneously in the car
*    Personal volume control
*    Carrier frequency: 2.8MHz(right); 2.3 MHz(left)
*    Speaker: 30mm mylar
*    Cone impedance: 32Ω±15%
*    Effective range (maximum): about 10 meters
*    Audio model: stereo
*    S/N ratio: ≥60dB
*    Channel separation: ≥40dB
*    Frequency response: 30 ~ 20,000Hz
*    Power supply: 2 AAA battery