Auto Power On and Pairing with Phone First Pairing First step - Open the charging case,long-press the multi-function button respectively, click any one of the earphones, the two earphones can be paired quickly. S econd step-turn on the blutooth of your phone and choose "Hi" After First Pairing Put the earphones in the charing case, click the charing button of charing box Then open the charing box to take out the earphones, they will be turned on and reconnected automatically How to do if only one earphone has sound or the other earphone does not be connected? Firstly, long-press the multi-function button to turn on the earphones, press the multi-function button for three times,the earphones will be turned down automatically, Secondly, put the two earphones back into the charing box, close the the cover, click the charing button of charing box, clear the pairing imformation Restart the earphones and turn on the Bluetooth of phone for Bluetooth pairing Face Recognition Technology The built-in touch sensor chip intelligently senses the wearing status. When you take down only the RIGHT earbud from you head, the music will pause, when you wear it, the music will continue to play. Superior Sound Quality 13mm dynamic speakers and noise isolation deliver clear and flawless in-ear call quality. Crystal clarity and deep, resonant bass with delicately tuned sound signature delivers you the immersive sound sound and put you on the stage center. Advanced Bluetooth 5.0 Adopt the most advanced Bluetooth 5.0 technology. Bluedio Hi Support A2DP, HSP, HFP, AVRCP. Provides in-call stereo sound. Also own fast and stable transmission without tangling. Clear Hands-free Calls Built-in Microphone Design, enables clear and Hands-free Call for any situation, providing a safety driving and riding environment.