The AL211 tritium watch is part of the Armourlite ColorBurst Series. The name is derived from the fact that these watches feature 3D colored luminescent numbers and tritium markers. The tritium markers by each number and the hour and minute hands are made with MB Microtec tritium gas vials, thus enabling these items to stay lit continuously all night and every night without the need for a battery or a push of any button. The 3D numbers feature a new technology in which they are charged by light source and retain some luminescence (charge depends on length of exposure) also without the need for a battery or a push of any button. Besides luminescent components, Armourlite ColorBurst watches are made with a shatterproof, scratch resistant high impact glass crystal. These watches also feature a double tempered stainless steel housing and a crown protector, which protects the crown from being damaged in the event you bump into something. In addition to being durable and well built, these watches feature an accurate and reliable movement with date function. Once in possession of these watches, they will become like a best friend, due to the fact that they include a lithium battery that lasts for an incredible 10 years! Unlike other watches, with Armourlite ColorBurst tritium watches, there is no need to part from your watch every two to three years to have the battery changed. Other features of the Armourlite ColorBurst watches are a 200m water resistance, military time, and 5 second increment numbers and markers on the the bezel. Durable 22mm width stainless steel band that nicely compliments the stainless steel case.