Overview:With the features of BT technology, built-in high-grade microphone & speaker, hands-free calling function and lightweight design, the headphone is convenient for you to listen to music and answer calls. A great companion for your daily life, office time, driving or travel. Features:BT Connection: BT4.1 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 60mAh battery lasts about 2 hours of working time on one full charge. Comfortable to Wear: 6g lightweight, in-ear design and ultra-soft earcap provide you long-time wearing comfort.Easy Operation: Easy to control playing/pausing music, previous/next track, answering/ending a call.Specifications:BT Version: BT 4.1Operation Range: Up to 10 meters (no obstacle)Frequency Response Range: 20Hz-20KHzImpedance: 32Sensitivity: 963dBHeadset Battery: 60mAh rechargeable Li-polymer batteryWorking Time: about 2 hours (depends on music volume)Standby Time: about 12 hours Time: 1-2 hoursColor: Black, White (optional)Main Item Size: Approx. 5.0*1.4*0.9cm/1.96*0.60*0.35inMain Item Weight: 6g/0.24ozPackage Size: Approx. 7.5*6.5*1.8cm/2.95*2.56*0.70inPackage Weight: 19g/0.67ozPackage List:1 * Headset 1 * Earhook1 * USB Cable1 * User Manual