ProTek is a brand of tritium tactical watches designed for Law Enforcement, Fire Fighters, SWAT, Tactical, Military, Special Forces, and First Responders. ProTek is a no-excuses brand that is Rugged at Heart and built to handle what life demands in any environment, lending credence to the tag line All Terrain Watches. ProTek watches were submitted to the US Marine Corps and were approved as an Official Watch of the USMC based on the accuracy, durability and superior ProGlo illumination that make these ideal timepieces to serve Marines in the line of duty, and in their daily lives. Specifications: 42mm Carbon Composite Case and 60-Click Dive Timing Bezel, 316L Stainless Steel Embossed Screw Caseback with USMC Logo, Steel Screw Crown with Multiple O-Rings, Sapphire Crystal with Antireflective Coating, Water Resistant to 300 Meters (all watches tested in air and water), Genuine Rubber Strap in Charcoal or USMC Pantone Colors (22mm x 20mm) with a Signature Buckle and a Steel Tube Molded into the Rubber for Additional Durability, USMC Branded, Dependable Japanese Quartz Citizen/Miyota 2S60 3 Hand & Date Movement with 10 Year Battery, Swiss self-powered ProGlo illumination.