Using your G - Shock 5600 Series Digital Watch is a breeze. Just press the buttons on the side to set the time, date, and other functions. You can wear it for swimming or other water activities as it's 200 - meter water - resistant, but avoid exposing it to hot water or steam. When it comes to maintenance, clean the watch regularly with a soft, dry cloth. The battery lasts about 2 years on a CR2016 battery. When it's time to replace the battery, it's best to have it done by a professional to avoid any damage to the watch.