Features: Bone Conduction Design: The sound transmits through the bone to the auditory nerve, no need to put into the ear, no eardrum damage, good for the user to avoid ear disease and hearing losing. Ear-free Keeping Danger Away: Release your ears to listen to the world, you can respond to the surrounding situation quickly, far away from danger. Born for Elderly People: Use the audio cable to connect the control box with the radio, phone, and other equipment. The elderly could hear and adjust the sound of the devices clearly from the 803 earphones. Function Volume Control: There is a sound pickup on the headset to control playback/pause, and there is a +,-volume adjustment key on the side, which is convenient for operation, healthy hearing for the elderly! Long Battery Life: 380mAh rechargeable Lithium battery provides up to 8-12 hours of playback time on one full charge, 1000 hours standby time foldable, and easy to carry. Specification: Model: BN802 Item: Bone Conduction Headphone Material: ABS Frequency range: 20~20kHz Microphone sensitivity: -54+/-2dB Working time: 8-12 hours Charging time: 3 hours Input: DC 5V 500mA Battery: 502530PL 3.7V 380mAh Sound Volume: right /left separately adjust Color: Black Main Item Weight: 62g / 2.19oz Package Size: 20*16*5cm / 7.87*6.3*1.97in Package Weight: 346g / 12.2oz Package List:? ? 1 * Bone Conduction Headphone 1 * Charging Cable 1 * 3.5MM Cable 1 * Lanyard 1 * Ear Plugs 1 * User Manual