Using your G-Shock watch is easy. Simply set the time according to the instructions in the manual. You can wear it while swimming as it has 200-meter water resistance, but avoid high-pressure water situations like diving with scuba gear. When it comes to maintenance, keep it away from extreme temperatures and chemicals. Wipe it gently with a soft cloth to keep it clean. The battery lasts about 3 years, so when it starts to run out, take it to a professional to replace the CR1025 battery to avoid any damage to the watch.