Bone Conduction Headphone Home Products Bone Conduction Headphone Specification - Type: Bone conduction stereo headphone - Standard frequency: 50Hz~4kHz - Optimum output: 30mW - Cord length: 120cm - Max. Output: 70mW - Plug: Stereo Ф3.5 - Impedance: 8Ω - Material: New environmental material - Sensitivity: 80db/mW - Weight: 60g Models: MGD-01(GRAY), MGD-02(WHITE), MGD-03(BLACK) Specific features - As the ear is not blocked, the user may hear from surroundings and this product is suitable to avoid possible risk during field activities such as mountain climbing and jogging. - It does not cause fatigue or hearing ability reduction even in the case of long-time use because it is designed by ergonomics. - High quality sound is accomplished with no use of an amplifier. - As the sound is directly transmitted to the auditory organ, this product is suitable to language learning and computer online learning. - It may be used for CD, MD, MP3, and sound collector.