Release your ears, enjoy the listening pleasure in a healthy and safe way with Bone Conduction headphone. Using innovative bone conduction technology, the headphone conducts the speaker through the bone and transmits sound to the bone near the external canal, then to auditory nerve. It avoids the occurrence of ear damage and hearing losing, giving your healthy listening.Features:  Ear-free Keeping Danger Away:Release your ears to listen the world, you can response to the surrounding situation quickly, far away from dangerous.Hands-free with Mic:With built-in Microphone, it supports hands-free calls, greatly set free you hands from answering the call during exercise.Born for Sports:IP55 waterproof and 38g light-weight design make it suitable for hiking, running, cycling, driving and other outdoor activities.Ergonomic Design:The back bone is made of high-end elastic titanium, flexible, undistorted, and environment-friendly, which allows comfortable wearing for hours.Long Battery Life:180mAh rechargeable Li-polymer battery provides up to 6 hours of playback time on one full charge and the standby time can last to 7 days. Highlight:* The sound transmits through the bone to auditory nerve, no need to put into ear, no eardrum damage.* Listen to HiFi music with CSR Bluetooth chip and CVC noise reduction enhances the call quality.* Easily control playing / pausing, adjusting the volume, answering / rejecting / ending an incoming-call.Specifications:Brand Name: VidonnModel Number: F1Bluetooth: V4.1Bluetooth IC: CSR8645Operation range: Up to 10 meters (no obstacle)Dynamic Unit: 15.3mmFrequency Range: 20-20KHzImpedance: 8Ω±15%Battery Capacity: 180mAhMusic Playing Time: up to 6 hours (depends on music volume)Standby time: 7 daysCharging Time: about 1.5 hoursColor: Grey-black, Grey-blue, Grey-yellow (Optional)Main Item Size: 13.0 * 11.6 * 5.0cm / 5.12 * 4.56 * 1.96inMain Item Weight: 38g / 1.30ozPackage Size: 16.0 * 14.0 * 6.0cm / 6.29 * 5.51 * 2.36inPackage Weight: 285g / 10.05ozPackage List:   1 * Bone Conduction Headphone1 * USB Cable1 * Pair of Earplug1 * English / Chinese User Manual