Features:COMFORT WEARING - Be free to choose exchange your left and right ear wearing, with glasses do not affect the wear. Compatible For iOS, 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, 4 hours continuous play,4hours 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: 2.4GHMic sensitivity: 42DbCall duration: 4 hoursCapacity: 75mAhTransmission distance: 10mStandby time: about 160 hoursCharge Time: about 1- 2 hoursCharging voltage: DC 5VProduct name: bone conduction headphoneMaterial: plasticPackaging Information:1*Y12 Headset