Features and pecifications: L X W X H: 3.8" x 2.1" x 2.5" (97 x 54 x 64 mm) WEIGHT:9.0 oz (255 g) WATER-RESISTANT: 10 ft. (3 m) depth MOUNT: 1" Weaver or MIL-STD-1913 rail BRIGHTNESS: 20 daylight settings POWER SOURCE: 1 x CR123 battery BATTERY LIFE: 1,000 continuous hours at nominal setting 12 at room temperature EOTECH XPS2-0 - Holographic Weapon Sight in black with 68MOA ring & 1 MOA dot reticle Mount - Compatible with both 1" Weaver and MIL-STD 1913 Rails Adjustable Brightness - The XPS2 has 20 brightness settings for use in any lighting scenario Compact Design - Leaves more rail space for rear iron sights or magnifier EOTECH HWS Prestige Warranty - Comes with 10 year limited warranty The XPS2 is the shortest, smallest and lightest EOTECH holographic weapon sight available. Its size and weight offer convenience for shooters and law enforcement officers. It runs on a single CR123 battery. This compact, single-lithium-battery configuration leaves more rail space for rear iron sights or magnifiers.