Our Royal watch is waterproof up to 10 ATM, making it suitable for swimming and showering. To ensure that no water enters the watch, it has a threaded crown. When you need to set the time, turn the crown until it "clicks" and then pull it out. In the pulled-out position, you can adjust the time. After the adjustment, push the crown back in and make sure to screw it in tightly to restore water resistance.