Mounting the case is relatively easy. The screws are hard to tighten. Use in water is not recommended. Once the bracelet and watch were wiped, I carefully disassembled the case. There was still a lot of water in the bottom of the case. Even if the Apple Watch 4 is waterproof it must be able to dry after use in water. The remaining water presents a risk of infiltration and may dry out leaving deposits. I do not recommend this product.