The open-ear design helps you always pay attention to your surroundings, avoid danger and enjoy music. you can listen to music, answer calls, also to hear notifications from the glasses, while still listening to the world around you. Smart sunglasses have a built-in microphone that allows you to make and receive calls. It have good waterproof effect, which can easily resist sweat and rain. The glasses are perfect for sports, music and calls. perfect for cycling, running, driving, boxing, fishing, playing basketball, shopping and other outdoor activities.syi