PHYSICAL COLOR CHANGING LENS: When there is no sunlight indoors, the anti-blue light lenses of these bluetooth glasses are clear-colored for work or study. Outdoors, the lens color will gradually change with the sunlight, it will become light grey on cloudy days with weak sunlight and dark on sunny days with strong sunlight, which can block UV400 rays.Whether you are indoors or outdoors, it will provide you with clear vision and different experience. AUTOMATIC POWER ON/OFF: After putting on the glasses, it will automatically turn on and connect to the paired device. If it is the first time to connect, find "Glasses E10" and click to connect. After taking off the glasses, each function such as music will automatically pause, and the glasses will automatically shut down after 15 seconds of no operation. [NOTE: You can only use various functions normally when wearing glasses.] LONG TIME USABILITY: These glasses are equipped with two 100mAh high-capacity batteries, which provide sufficient power to ensure a long battery life. Standby time is about 7 days, phone call time is about 6 hours and music play time is about 4 hours. It can be fully charged through magnetic charging in about 90 minutes, which is convenient for you to use. SMART ONE-HANDED OPERATION: The sunglasses temples are equipped with touch sensors, which allow you to fulfill various commands such as answering calls, playing music and adjusting the volume with just one click. One click to answer or end a call, play or pause music; two clicks to switch songs, adjust volume and take photos remotely; three clicks to wake up the voice assistant; four clicks to switch languages. SUITABLE FOR MULTIPLE SCENARIOS: These color-changing lens glasses are no longer limited to outdoor scenarios, but can also accompany you during indoor activities. Whether you are indoors working, reading, in a meeting, playing games, or outdoors traveling, driving, walking, fishing, our Bluetooth Smart Glasses can accompany you and enhance your experience by playing music or providing voice assistant operations.