Using this Citizen watch is a breeze. You can easily set the date and choose between 12 or 24 - hour time. Just use the buttons on the side of the watch. The chronograph function lets you time events up to 60 minutes with 1/5 - second precision. When it comes to water resistance, it can handle splashes and swimming up to 100 meters, but don't use it for scuba diving. Keep an eye on the low - charge indicator. If it shows, expose the watch to light to recharge it. The power reserve of 9 months means you don't have to worry about charging it often. For maintenance, wipe the watch with a soft, dry cloth regularly. Avoid hitting it against hard objects as it has a mineral crystal which can get scratched. Also, if you notice any issues, take it to an authorized Citizen service center.