1. two channel IR wireless headphone
2. Carrier frequencies: A: 2. 3MHz/2. 8MHz±5KHz 
 　                       　         B: 3. 2MHz/3. 8MHz±5KHz
3. Speaker impedance: 32 Ω 
4. S/N ratio: >55dB 
5 . Foldable design, convenient for traveling users especially for users of in car audio devices(portable DVD,GPS,etc)
6. Fully compatible with TV,CD,VCD,DVD, MP4,PC and other audio devices with IR transmission module
7. Power requirement: 2 X AAA batteries (not included)