Using this Citizen Eco - Drive chronograph is a breeze. To set the time and date, just use the crown on the side of the watch. You can switch between 12 - hour and 24 - hour time easily according to your preference. The chronograph function, which can measure up to 60 minutes in 1/5 - second increments, is activated by the buttons on the side. As for water resistance, it can handle splashes and short swims up to 100 meters, but don't go diving with it. When it comes to maintenance, keep it away from strong magnetic fields as they can affect the accuracy. Wipe the watch with a soft cloth regularly to keep it looking good. If the low - charge indicator shows, just expose it to light to recharge the battery, which can hold a charge for up to 9 months.