Using your G - Shock GA2000SKE - 8A Youth Sports Watch is a breeze. To set the time, just follow the simple instructions in the manual. You can easily switch between different time zones using the World Time Feature. For the Countdown Timer, enter the desired time and start it when needed. The Double LED Light can be activated with a simple button press to light up the dial. The Full Auto - Calendar will update itself, so you don't have to worry about leap years. The Stopwatch and Alarm are straightforward to operate too. When it comes to water resistance, while it can handle being submerged up to 200 meters, avoid pressing buttons underwater. Also, don't wear it in hot tubs or saunas as extreme temperatures can damage the watch. To keep it in top condition, clean it regularly with a soft, dry cloth. If it gets dirty, you can gently wipe it with a damp cloth, but make sure to dry it thoroughly afterwards.