Mpow Shield Bluetooth 4.0 Wireless Headset/Earpiece/Car Earphones Bluetooth 4.0 with HD sound for high-fidelity music and clear speech, You can begin enjoying high quality HD sound instantly. Signal Enhance Technology: Mpow adopts signal enhancement technology with better chips to enable better stable signal range. Awesome ear tips, made from biological Silica gel, safe, stable and not easy to slide. Integrated multi-point technology lets you connect two devices at once, so you can seamlessly switch between your business and personal phones. Up to 5.5 hours of continuous talk and music time, 160 hours of standby time per charge cycle.