The reviewer wanted to test Unotron’s Washable Wireless Keyboard for its waterproof quality, so he tried sinking the keyboard in water. However, this didn’t work because Unotron manufactured the keyboard in such a way that even its internal elements were watertight. The air inside the keyboard let it float on the water. After putting some weights on the keyboard and successfully sinking it, it was still fully functional. This was impressive, although the reviewer had one complaint. The metal key that sealed the waterproof battery door was glued to the bottom of the keyboard with non-waterproof glue. The reviewer’s water test detached the metal key from the keyboard. Another worry that the reviewer had was that regular battery replacement might loosent he waterproof seal a bit in the long run. These are minor flaws, since it doesn’t affect the keyboard’s great performance in any way.