【BONE CONDUCTION TECHNOLOGY】:Bone conduction glasses are mechanical vibrations that convert sound into different frequencies, many steps of sound wave propagation are omitted,and it doesn't affect other people because the sound waves diffuse in the air,only the wearer can hear. Sound passed through directly to the auditory nerve bones, will not cause damage to the ear canal and eardrum. Compared with other boneconduction eyewear, this device's sound leakage has been reduced by 60%. 【CAN BE USED WITH PRESCRIPTION LENSES】: The lens can be changed very easily. If you need myopic lenses, you need to go to a professional optical shop. And we provide free transparent lens mold for Myopia&Older. 【OPEN EAR DESIGNE】: Ear can easily listen to music when you hear the sound of traffic around, guarantee travel safety 【HIGH PERFORMANCE】: Rechargeable lithium battery (250mAh/3.8V), Charging time:2hours, Standby time:300hours, playing music about 3-4 hours (depending on the volume and sound source varies), continuous call about 4-5 hours. Bone conduction bluetooth headset sunglasses compatible with Smartphones Iphone LG HTC Samsung Android Windows. 【NOTE】：Because of the limits of bone conduction technology, there is a sound leakage of the bone conduction products. And the sound quality has little difference with the traditional headphones. Brand No Brand SKU 100094741_NP-1020344935