Bluetooth Headset, Bluetooth Headphones V4.1 Sport Wireless Bluetooth Stereo Earphones Sweatproof In-Ear Noise Cancelling Headphones Earbuds Headset with Microphone for Running & Exercise (Black) QY8 bluetooth wireless headphones is equipped with Bluetooth 4.1 + EDR APT-X audio decode technology, offering you perfect stereo sound. It can connect with 2 cell phones or tablets at the same time, compatible with most Bluetooth-enabled devices with 10-meter working distance. Super Endurance & Long battery life: Built-in high performance polymer 80mAh battery, 2 hours charging time, up to 6 hours talking/playing time, and about 175 hours standby time with a single charge. Perfect Stereo & CVC 6.0 Noise Cancelling Technology: with superior sound isolation, efficiently reduces unwanted sounds and outside noises, and hands-free phone conversation, so nothing breaks your concentration. Stable Connection with Ear-fitting Design: ergonomic in-ear design to specifically fit the contours of your ears, so they stay in place even when you're running, jogging & exercising or other activities; Behind neck bluetooth headphones, get rid of troublesome wires tangling. Simple-to-use: Control all functions of your music (volume, sound, song selection) and calls from your phone via our simple-to-use user interface on the headphones themselves. If you are not satisfied, we provide any refund or return service.