Using this G - Shock ITZY collaborative watch is easy. To set the time, use the buttons on the side of the watch. For world time, press the appropriate button to switch between different time zones. The stopwatch and timer are also controlled by the side buttons. To use the alarms, set the time for each alarm and activate them. The double LED lights can be turned on by pressing a specific button, and you can choose the illumination duration. When it comes to maintenance, keep the watch clean by wiping it with a soft cloth. Avoid exposing it to extreme temperatures or chemicals. Although it's water - resistant up to 200 meters, don't leave it submerged for extended periods. If the battery runs out after about 3 years, take it to a professional to replace the CR1025 battery. That way, your watch will keep looking great and working well for a long time.