Bone conduction headphones are designed to transmit sound through the vibration of the human jawbone, release both ears, and help people with hearing loss. It uses Bluetooth 5.0 wireless connection, you can listen to music and answer calls without plugging the receiver into the ear canal, and your ears can hear the surrounding sounds, which is very safe. Specification: Bluetooth version: 5.0 Headphone capacity: 40mAh Charging bin capacity: 1800mAh Transmission distance: about 10m Standby time: about 7 days Talk time: about 3 hours Support system: all devices and mobile phones that support Bluetooth Notes: 1. Please read the instruction manual carefully before use. 2. If you receive a defective product or have any questions during use, please feel free to contact us. Packing List: Headphone*2 Charging compartment*1 Charging cable*1 Manual *1 Certificate of conformity*1 Warranty card*1