Horizon Outdoor Alien 5 Bone Conduction Glasses Wireless Bluetooth 4.1 Headphones Polarized Sunglasses Myopia Waterproof Wireless Headset Hearing Aid for iOS Android Brilliant Black Frame(Blue Ray) UPGRADED BONE CONDUCTION SPEAKER:Upgraded bone conduction speaker, with the exclusive soundproof cavity design, reduced the sound leakage by 87%. CAN BE USED WITH PRESCRIPTION LENSES:The lens can be replaced very easily, and we provide free transparent lens mold for Myopia&Older. OPEN EAR DESIGN GUARANTEE YOUR SAFETY AT ANYWHERE:You can easily listen to music and you aslo can hear the sound around, guarantee your safety when you are running cycling etcs. not hurt your ear drum even after a long-time wear. HIGH PERFORMANCE&UV 400 PROTECTION: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. As qualified bone conduction manufacturer, our products accept all professional instrument test.