Bluetooth 4.1 and CSR 8645 Chipset strengthen the signal 2 times, easy and fast pairing with bluetooth device, APT-X +EDR audio decode technology provide Bluetooth Headsets powerful audio driver balanced stereo audio sound. Comfortable stable Earbuds: Portable and Lightweight Bluetooth Earbuds, unique flexible design and built-in earhook interchangeable Sweatproof Earbuds, ensure perfect fit and remain stable in your ear when running, Walking or exercising. Hi-Fi Stereo Sound: Built-in HD Microphone with CVC6.0 noise cancellation,give bluetooth earphones Hi-Fi Stereo Sound and Strong Signal. Let you enjoy high quality and clear music/calls voice even in noisy environment like gym/running/cycling on the road. Powerful Rechargeable Battery:Built-in polymer lithium battery(100mAh), up to 160 hrs of stand-by,up to 8 hrs of talk time and 2 hrs charging time. Wireless Headphones can pair with 2 bluetooth device at the same time with 10-meter working distance. Easy-of-using:Simple user interface on one of best headphones allows adjust volume, track songs and answer/reject calls.Sports Headphoens pair with iPhone6s 6s plus Samsung Phones and Android phones.