Specification: Condition: Brand New Two Channel: Channel A: 2.8 MHz for the right channel; 2.3 MHz for the left channel Channel B:3.8 MHz for the right channel; 3.2 MHz for the left channel Speaker: 30mm for Mylar Cone Impedance: 32 15% Effective Range (maximum): About 10 Meters Power Source: 1 X AAA Battery (not Included) Noise Ratio: 70dB Channel Separation: 40dB Frequency Response: 30-20,000Hz Audio Model: Stereo Automatically turn on when the wear and shut down when take it out of function Package List: 1 Pair of Infrared Earphone Note: 1.Audio cable and batteries is not included. 2. The infrared headphones is mainly used for the car DVD, if you need it for the TV, please buy transmitter to pair with the headset, otherwise the headphones will not work at all. - Fitment: Universal. - Ergonomic design, which can bring you comfortable wearing experience. Stereo audio model, which has clear sound quality without distortion. - Auto power mute and auto off headphone function, which is convenient for using. infrared stereo headset for car, easy to operate, which is a wonderful accessory. - Foldable and lightweight design, convenient to carry and store. - Product Detail: Built to meet standard specification, strictly follow factory quality control.Fine workmanship, wearresistance and the service life is longer. - After-sales service: We are a professional seller. If you have any problems using our equipment, you can our customer service staff who will provide you with a solution in a timely manner.