Wireless automotive headphones

1) Infrared wireless stereo headphone (2 CH) for cars
2) Ergonomic design for comfortable wearing
3) Auto mute and auto power off function on headphone
4) Swivel Design

5) Dual channel
6) Carrier frequency:
    a) A channel: 2.8MHz for right channel; 2.3MHz for left channel
    b) B channel: 3.8MHz for right channel; 3.2MHz for left channel
7) Speaker: 40mm mylar
8) Cone impedance: about 32ohm
9) Effective range (maximum): about 10 meters
10) Power source: 2 x AAA batteries
11) Battery life: about 48 hours
12) Audio model: stereo
13) S/N ratio: 70dB(minimum)
14) Channel separation: 40dB(minimum)
15) Frequency response: 30-20,000Hz