ArmourLite Caliber Series AL623 Watch, Tritium Illumination, Black Steel Band Designed to meet the demanding needs of law enforcement officers, military personnel, first responders and extreme outdoorsmen Tough 47mm polycarbonate case with a scratch-resistant sapphire crystal Swiss Made Ronda 515 Quartz movement for premium accuracy with a 45-month battery Green and orange tritium tubes for continuous, battery free, illumination that lasts for up to 20 years Water resistance of 200 meters or 660 feet and comes with a 2-Year manufacturer's warranty