Using your Tissot PR 100 watch is easy. Just look at the SuperLuminova - coated hands to tell the time, even in low - light conditions. The quick - release bracelet system allows you to change the bracelet without any tools whenever you want. When it comes to water resistance, it can handle up to 10 bar (100 m / 330 ft) of pressure, so you can wear it while swimming or in the shower. But don't use it for deep - sea diving. For maintenance, keep your watch clean with a soft, dry cloth. Avoid hitting it against hard objects as it may damage the scratch - resistant sapphire crystal or the 316L stainless steel case. If you have any issues, take it to an authorized Tissot service center.