Features: Painless Hanging Design: Release your ears to listen the world, you can response to the surrounding situation quickly, far away from dangerous, suitable for outdoor activities. Keeping Ear Disease Away: No earplug, no need to put into ear, avoid ear disease and ear pain caused by sweat in ears when excercising. Light-weight design, comfortable to wear. High Definition Music: Wireless BT4.2 technology ensures transmitting strong signal in high quality and high speed, offering high-fidelity stereo music. Hands-free with Mic: High-quality Microphone grasps the detail of voice and enables hands-free calls, setting free your hands from answering the call during exercise. Long Battery Life: Built-in rechargeable 90mAh Lithium battery lasts about 4 hours of playing time per charge cycle. Recharged via the included USB charging cable.