The Time Timer Watch is waterproof up to 30 meters, which means that it can be worn for general use in situations like the shower, a rain storm, or the pool. While the watch can be worn in those types of situations, the buttons to set the watch should not be pressed while the watch is under water. This can cause water to enter the main housing of the watch. General wear and use should not cause water to enter the watch. The watch is not suitable for diving.