SEIKO Sportura Men's Kinetic Chronograph Watch # SNL015 SNL015P1 . SEIKO Sportura Kinetic Chronograph. Caliber: 7L22. Stainless steel case with integrated bracelet. Tachymeter marked tungsten bezel. Kinetic movement, no battery required. Jet-black dials with vivid orange highlights. Specially coated non-reflective sapphire crystal. Lumibrite markers. See through case back. Stainless steel crown with orange highlights. Screw on crown. Chronograph records elapsed time up to 45 minutes in 1/5 seconds. Tachymeter timer. Energy storage in capacitor: 5 months. Quick start function. Water resistant to 100 meters. Approximate Case size: 43 mm (including crown) x 44 mm (length) x 13 mm thickness. (Kinetic Watches are SEIKO's latest and most technically advanced watches, which contain their own internal electrical generators--operated by natural wrist movements--making them independent of conventional storage batteries.)