The St Moritz M1 watch is a strong and versatile sports watch. The tough 316L stainless steel case, unidirectional rotating bezel, high water resistance (200M) and screw-down crown make this a great watch for diving, and water sports use. The face has excellent contrasts and glows in the dark for excellent visibility under all lighting conditions. The rubber strap is very durable, easily adjusted by the user "in the field," and light to wear.Stainless steel (316L) case Unidirectional rotating bezel Screw-down crown Mineral glass crystal Blackout superluminous hands and markers Water resistant 200M Quartz movement, with 3 year battery life Extendable warranty. Send the watch to St Moritz, and they will clean/refurbish as necessary and renew your warranty for a nominal charge.