Using your LEFF Amsterdam D38 Tube Watch is a breeze. Just put on the 20 - cm long black leather strap around your wrist. The watch with its Japanese Miyota quartz movement will keep accurate time. It has 5 ATM / 50 - meter water resistance, so it can handle a bit of splashing or short swims, but don't leave it underwater for too long. When it comes to maintenance, keep the watch away from harsh chemicals as they might damage the 316L stainless steel case or the leather strap. If the strap gets dirty, you can gently wipe it with a soft, damp cloth. The mineral glass lens is quite durable, but try to avoid scratching it. Remember, this watch comes with a 2 - year warranty, and it's covered by a 30 - day return policy if you're not satisfied.