Features: COMFORT WEARING - Be free to choose exchange your left and right ear wearing, with glasses do not affect the wear. Compatible For iOS, for Android, for WP system, as long as the devices have Bluetooth, it can be used. Bluetooth 4.2 Bone conduction headphone SINGLE EAR HOOK TYPE HEADPHONES - Small and covert, more comfortable. is very light, painless wearing in long time use, latest concept ergonomics design fully fit outside the auricle. CLEAR CALL AND HIGH QULITY - Built-in high-performance lithium battery, 5-6 hours continuous play, 5-6hours continuous call, 1-2hours fast charge. SPEAKER UNIT IS EXTERNAL - 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. Specifications: Bluetooth Profiles: HSP1.2HFP1.6 A2DP1.3AVRCP1.5D11.3 Bluetooth version: V4.2+EDR Wireless frenquency: 2.4GHZ Mic sensitivity: 42Db Call duration: 5-6 hours Model: S-103 Size: 71.9*43.6*7mm Battery Capacity: 90mAh Transmission distance: 12m Play time: 5-6 hours Standby time: about 100 hours Charge Time: about 1- 2 hours Charging voltage: DC 5V Product name: bone conduction headphone Material: plastic Working temperature: 10°C-50°C Package Included: 1 * USB cable 1 * bone conduction headphone 1* manual