Using your Tissot Chrono XL watch is easy. To use the chronograph function, just press the buttons on the side of the watch. You can start, stop, and reset the timer. This watch is water-resistant up to 10 bar, which means you can wear it while swimming or doing light water activities, but don't take it for deep - sea diving. For maintenance, keep it away from strong magnetic fields as they can affect the quartz movement. Clean the case and band regularly with a soft, dry cloth. If the leather strap gets wet, dry it gently and avoid using harsh chemicals on it. With proper care, your Tissot Chrono XL watch will serve you well for a long time.