HUI Wireless Bluetooth In-Ear Earphone Headphone EDR Stereo Sweatproof with Bass Noise Cancelling and Hands Free Calling & Mic Running Exercise Earbuds Headsets (green) Attention:press the power keys for more than 5 seconds to go into pairing mode LED indicator light will flash,showing red and blue alternately. We tested all the products sent out If you have any question, please contact us we can solve all problems Fashion and Sports Design. The earbuds head can be adjust 45 degree. Makes you can find the most comfortable wearing state. Quite lightweight sports earphone ideal Easily accessible in-ear controls let you control music and calls through our Bluetooth technology while running, biking, and other forms of exercise Bluetooth 4.1+EDR technology: easy and fast pairing with Apple or Android smartphones, tablets and other Bluetooth enabled music devices; provides pure, CD-like high quality stereo sound for compatible devices. Built-in 80mAh rechargeable battery, up to 4 hours music/talking time. Only need to charging 2 hours.Built-in HD and sensitivity microphone. Support hands-free calling. Makes you can enjoy clear and natural sound when calling.