B18 Bone Conduction Bluetooth V4.1 Sports Headphone Earhook Headset, For iPhone, Samsung, Huawei, Xiaomi, HTC and Other Smart Phones or Other Bluetooth Audio Devices 1. Bluetooth 4.1 Bone conduction headphone 2. Small and covert, more comfortable. is very light, painless wearing in long time use, latest concept ergonomics design fully fit outside the auricle. 3. Loudspeaker close to the ear but it is not inside the ear. It will help listens to the surroundings at the same time, let you keep safety for biking, running, driving and more portable for business, work. 4. Be free to choose exchange your left and right ear wearing, with glasses do not affect the wear. Compatible iOS, Android, WP system, as long as the devices have Bluetooth, it can be used. 5. Using CVC6.0 + DSP audio processing dual noise reduction technology to improve the sound quality. Built-in high-performance lithium battery, 5-6 hours continuous play, 5-6hours continuous call, 1-1.5 hours fast charge. And have integrated keys, voice prompts, electricity display and other functions.