Model Size：for Apple Watch Series Series 7-45mm/Series 8-45mm/Series 9-45mm model and size design.so please check the model number on the back of the watch before purchasing to make sure you buy the right case. Waterproof Design:YIJDACASE adopts upgraded sealing ring waterproof technology, which can ensure that water will not enter between the protective case screen protector and the watch screen in daily life, and maintains the screen clarity and touch sensitivity, (Note: It can not be waterproofed in deep water activities.) (Tips:Waterproof area refers to the screen, not the side of the watch). Quality Material：Made of high quality PC material and 9H tempered glass screen protector, tough rear bumper frame protects the screen and edges from scratches, cracks and impacts. Easy Installation:Use the alcohol packet provided inside the kit to remove the dust from the case, then peel off the case film, the case is a snap-on design to avoid removing the strap first. Just install it from the crown part first and then press the frame. YIJDACASE SERVICE: If you encounter any defects or quality problems, please contact us in time, we will solve the problem for you within 24 hours! YIJDACASE【2 Pack】2 in 1 Waterproof Case for Apple Watch Screen Protector 45mm Series 7 8 9 Accessories with Tempered Glass Film Protective & PC Bumper Cover Compatible iWatch 45mm