Using your G - Shock watch is a breeze. Simply set the time and date according to your needs. When you're out for water - related activities, it can handle up to 200 meters of water pressure, but avoid pressing the buttons underwater. As for battery life, it should last about 3 years on SR726W X2 batteries. When it's time to replace the battery, it's best to have it done by a professional. To keep your watch looking great, clean it regularly with a soft, dry cloth. Avoid exposing it to extreme temperatures or harsh chemicals. This watch is shock - resistant, but still try to prevent it from getting hit hard. Enjoy your stylish and tough G - Shock watch!