Precise Design: 45mm waterproof case is designed by the real size of apple watch series 7, unique professional design supports all functions, which can be used smoothly while wearing this case, seamless access and easy control of all buttons. Built-in Screen Protector: The case comes with a screen protector, it can prevent your apple watch from scratches, dust, sand and doesn't affect the screen touch sensitivity. Clear Sound: 360-Degrees full sealed case body is essential to a good waterproof performance. So, in order to keep a good sound transmission, we designed a small breathable film in the speaker holes, please do not break it. Installation: Step 1: Remove your own screen protector before installation Step 2: Find the small notch in the the lower left corner of back cover, open the back cover Step 3:Put your Apple watch into the front cover of the case, align the back cover Step 4: Press all sides of the case to make sure the case is completely closed. Small Tips: 1: Please take a waterproof test with a tissue before installation and perform the waterproof test without your watch at regular intervals. 2: To keep a clearer sound transmission, please turn up the volume when you are on the phone with others.