The waterproof case is really a large bag that has clear plastic and a closure on top keeping water away from your device. It is water resistant and will protect your device from water, sand, snow, and spills without affecting its use. Besides, this waterproof case allows full use of your iPhone's screen and controls so even in water you can play games, watch movies, go online, and do all the other things you love to do with your iPhone 4 ! Best of all, this case has been designed to float if dropped in the water, so you can easily find it.