Matching method（how to connect both devices) 1.After the glasses boot, automatically enter the matching state, red and blue light flashing alternately. 2: open the device to connect, search and connect the device: TWS-F , the deviceautomatically pop-up matching window, click on the match can be connected successfully Mirror leg +30° Highly elastic space,Positive and negative 30 high elastic spaceHumanized “spring” mirror legConform to your facial structure and comfortSuitable for people with various facial types Using Type-c charging interface, charging fasterLong endurance, fast and convenient Functions Function Guide & Why choose this Smart Audio Sunglasses? 1.Built-in microphone free for calls Calls, Music,Navigation,easy operate; 2.Fashion delicate design as a sunglasses ; 3.Comfortable fit lightweight; 4.IPX4 Waterproof; 5.Necessary for outdoor driving,finishing,cycling,hiking,camping,vacation