With the features of Bluetooth technology, built-in high-grade microphone & speaker, hands-free calling function and lightweight design, the headphone is convenient for you to listen music and answer calls. A great companion for your daily life, office time, driving or travel.  Features:Bluetooth Connection: Bluetooth 4.0 ensures strong signal and wireless connection range is 10 meters (no obstacle).Hands-free with Mic: High-quality Microphone grasps the detail of voice, ideal for in-car calling or working use.Long Battery Life: Built-in rechargeable 55mAh Lithium battery lasts up to 2 hours of working time on one full charge.   Easy Operation: Easily control playing / pausing, answering / rejecting / ending a call and redialing the last number.Comfortable to Wear: 6g lightweight, in-ear design and ultra-soft earcap provide you long time wearing comfort.Specifications:Bluetooth Version: Bluetooth 4.0Operation Range: Up to 10 meters (no obstacle)Frequency Response Range: 20Hz-20KHzImpedance: 32ΩSensitivity: 95±3dBHeadset Battery: 55mAh rechargeable Li-polymer batteryWorking Time: about 2 hours (depends on music volume)Standby Time: about 12 hoursCharging Time: 1-2 hoursColor: BlackMain Item Size: Approx. 5.0 * 1.4 * 0.9cm / 1.96 * 0.55 * 0.35inMain Item Weight: 6g / 0.24ozPackage Size: Approx. 7.5 * 6.5 * 1.8cm / 2.95 * 2.56 * 0.70inPackage Weight: 17g / 0.62ozPackage List:1 * Headset   1 * Earhook1 * USB Cable1 * User Manual (Chinese / English)