Features: stainless steel case pu strap automatic movement caliber: miyota 8215 21 jewels vibrations per hour: 21,600 bph shock system: parashock winding direction: uni-directional (left) sapphire crystal black dial with logo "ratio" analog display 40 hours power reserve luminous hands and markers date display screw down crown engraved caseback (with image of a free diver) buckle clasp 500m water resistance approximate case diameter: 42mm approximate case thickness: 13mm