The HWS EXPS2™ maximizes rail space with its compact design and provides co-witnessing with iron sights. Convenient side buttons make it simple to pair with a magnifier, while its adjustable, locking quick-detach lever ensures fast, secure attachment and easy removal for ultimate versatility. L × W × H 3.8" x 2.3" x 2.9" (96.5 x 58.4 x 73.7 mm) Weight 11.2oz (317.5g) Mount 1" Weaver or MIL-STD-1913 rail Windage & Elevation Adjustment 0.5 MOA per click Night Vision Compatibility No Brightness 20 daylight settings Power Source 1 x CR123 battery Country of Origin Made in USA Water Resistant 10 ft. (3 m) depth Battery Life 1,000 continuous hours at nominal setting 12 at room temperature *600 for green reticle Operating Temperate -40°F to 140°F (-40°C to 60°C) Sealing Fog resistent internal optics