This item is a -in headset. It should be put into the to fix tightly. It will not cause much pressure to your ear if you wear it for a long time. It has a built-in microphone phone call if there is a call coming without taking your hand. Feature - Equipped with 4.0 and EDR technology, it is compatible with most kinds of smartphone, providing efficient and convenient communications in the riding. - speakers make you enjoy crystal and music from your cell phone - Hands-free, built-in microphone enables you to answer phone without holding your phone during driving. - Set-in rechargeable Li-ion battery, long stand-by and working tim. - Please do not too loudly in driving. Specifications Color: Black Size: 15.5 x 4.3 x 1.5cm version: .0+EDR Frequency range: 2.4026GHz-2.480GHz Charging time: ; 1 hour Standby time: ;160 hours Continuous working time: ;8 hours Transmission range: 20-30 meters Microphone transmission distance: ; 1 meter Unilateral headset power: 0.5W Lithium-ion battery: 3.7V / 150mA Charging voltage: 5V Package list: 1 x Headset 1 x Manual