Wireless Osteoconductive Headset Bluetooth Headset Bluetooth 4.1 Headset Earphone Stereo Headphone Feature: EAR HOOK TYPE HEADPHONES - Small and, more comfortable. is very light, wearing in long use, latest concept ergonomics design fully fit outside the auricle. SPEAKER UNIT IS EXTERNAL - Loudspeaker close to the ear but it is inside the ear. It will help listens to the surroundings at the same, let you keep for biking, running, driving and more portable for business, work. COMFORT WEARING - Be free to choose exchange your left and right ear wearing. Compatible iOS, Android, WP system, as long as the devices have Bluetooth, it can be used. CLEAR CALL AND HIGH QULITY - Using CVC6.0 + DSP audio processing noise reduction technology to improve the sound quality. Built-in high-performance lithium battery, 4 hours continuous play, 4 hours continuous call, 1.5 hours fast charge. And have integrated keys, voice prompts, electricity display and other functions. Bluetooth Standard: V4.2 Transmission distance: 10m Bluetooth Profiles: HSP1.2、HFP1.6 、A2DP1.3、AVRCP1.5、D11.3 Play time: 4 hours Call duration: 4 hours Standby Time: Up to 160 Hours Charge Time: about 1.5 hours Battery Capacity: 75mAh Wireless frenquency: 2.4GHZ Material: Plastic Package Include: 1X Bluetooth 4.1 Headset 1X Charging cable