Using your Citizen AN8210-56E Chronograph is a breeze. The chronograph function allows you to time events easily. Just press the buttons on the side of the watch. The fold-over clasp with a push button makes it simple to put on and take off the watch. Keep your watch in good shape by exposing it to light regularly to keep the Eco-Drive technology working. Avoid exposing it to extreme temperatures and strong magnetic fields. When it comes to cleaning, use a soft, dry cloth to wipe the watch. If you need to clean the bracelet, use a mild soap and water solution and dry it thoroughly. And remember, this watch is water-resistant up to 50 meters, but it's not suitable for diving or high-pressure water activities.