BT Connection BT 4.1 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 One button easily controls playing/pausing, answering/ending a call.