Replacing the battery on a watch is a drag. Grab the Casio Tough Solar Runner Watch and get out under the sun to train while also charging this watch's battery. Up to 120 records of lap memory, along with elapsed time, lap time, and split time, plus two countdown timers, help with interval training, and five alarm settings make sure that you won't be late reaching your goals. In case your journeys have you making a foray into the water, not to worry as this watch is water-resistant to 100 meters. Unfortunately, they haven't yet figured out how to make a watch that keeps you from falling off your board into the water in the first place. Maybe that'll be in the next edition.