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 headphoneSINGLE 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: HSP1.2.HFP1.6 .A2DP1.3.AVRCP1.5.D11.3Bluetooth version: V4.2+EDRWireless frenquency: 2.4GHZMic sensitivity: 42DbCall duration: 5-6 hoursModel: S-103Size: 71.9*43.6*7mmBattery Capacity: 90mAhTransmission distance: 12mPlay time: 5-6 hoursStandby time: about 100 hoursCharge Time: about 1- 2 hoursCharging voltage: DC 5VProduct name: bone conduction headphoneMaterial: plasticWorking temperature: 10C-50C Package Included:1 * USB cable1 * bone conduction headphone1* manual