Luminox' EVO F-117 Nighthawk model 6401 features solid stainless steel construction with black PVD plating, a nearly scratchproof sapphire crystal, Swiss quartz movement with a 10-year lithium battery, black rubber strap, water resistance to 200 meters and a unidirectional ratcheting bezel. Model 6401 also has the Luminox tritium illumination system.