Description Bone conduction concept design, music experience does not hurt the ear, bone conduction design, through the bone directly to the ear, without passing through the eardrum, reduce the damage to the eardrum hearing, protect the hearing, listen to the music at the same time can pay attention to the outside. Features -Color: Black. -Material: ABS. -Size: About 14.00X12.00X4.00cm/5.50X4.72X1.57in. - Perfect for sports, running, driving, workout, gym, relaxation, travelling and etc. - Lightweight body design, long-term wear without a sense of weight, freedom of movement. - It is comfortable to wear and does not pinch ears. It protects the ear canal from damage. - The lightweight and comfortable wireless stereo headphones is the safest alternative to traditional sports headphones. - It has advanced bone conduction technology, open earphone design and secure fit design. Specification: Version: 5.1. Frequency range: 20HZ-20KHZ. Headphone battery capacity: 130MAH. Transmission distance: >10m. Talk time: 6 hours. Playing time: 5 hours (80% volume). Standby time: 120h. Charging time: 1.5h. Bone conduction headset, not ear-in type, protect ears, convenient for sports use. Transmission distance up to 10m, lower power consumption, faster transmission speeds, no delay in playing games. Built-in 130 mAh battery, up to 6 hours of talk time, 120h of standby, only 1.5 hours of charging time. Light and easy to wear without any pressure. does not affect wearing glasses when wearing the headset. Flexible body material, not damage to the headset, painless wearing.