Bone conduction headsets Hearing aids Headphones Audiphone AUX IN for the hearing impaired. The sound can be directly transmitted through the skull to the inner ear. More comfortable and healthier: sound is transmitted through the bone to the auditory nerve, more comfortable and healthier than traditional hearing aids, suitable for people with listening problems. Prevention of ear diseases: No need to put in the ears. It releases the ears to allow air to circulate, it is easy to clean to avoid ear diseases caused later. Keeping danger without using your ears: Release your ears to listen to the world, you can react quickly to the surrounding situation, away from dangerous, suitable for many indoor and outdoor activities. Technical data: Black color Model: YKL-801 Name: Bone Conduction Hearing Aid Battery capacity: 350mA. Input: DC 5.0 V, 500 mA Frequency: 20 Hz-20 kHz. Playing time: about 10 hours. Charging time: about 4 hours. Standby time: 60 days or more Reception sensitivity: -54 ± 2 dB Package Weight: 153g. Package contents: 1 x Bone Conduction Hearing Aid 1 x USB cable 1 x Audio cable 3.5 mm to 3.5 mm 1 x User Manual.