Precision multi-function OS80 power alarm quartz chronograph; Features 1/20th second, 60 minutes & 12-hour accumulated elapsed time; Tachymeter; Case in solid 316L stainless steel; satin or black PVD finish; Unidirectional; ratcheted 0-60 bezel; Screw-locked crown & screw-in back; Super-LumiNova advanced illumination system on hands & numbers; Hardened mineral crystal; Water resistant to 330ft; Diameter 38mm; Thickness 12mm; Weight 3.5oz. ; Serial numbered; 2 year international warranty; Also available with a black leather waterproof band; Designer rubber band with silver or black steel reinforcements and push-button deployment buckle.