The Casio G-Shock Classic GAW-100B-7AER is a men's watch with a robust appearance. The watch case is shockproof and water resistant up to 20 bar, so you can swim and snorkel with it. Besides the time, the display also shows the date and the day of the week. You only need to rotate your wrist for the display to automatically light up in dark situations. The watch battery is powered by light energy. The watch also has a stopwatch, timer, and you can set up to 5 alarms on it.