The HWS EXPS2 maximizes rail space with its compact size and allows for co-witnessing of iron sights. It has convenient side buttons to add a magnifier and features an adjustable, locking, quick-detach lever for easy attachment and removal. Included in the box: HWS EXPS2 Quick-Start Guide Warranty Card CR123 Battery Product Specifications L X W X H: 3.8" x 2.3" x 2.9" (96.5 x 58.4 x 73.7 mm) Weight: 11.2oz (317.5g) Water Resistant: 10ft. (3 m) depth Mount: 1" Weaver or MIL-STD-1913 rail Windage & Elevation Adjustment: 0.5 MOA per click Brightness: 20 daylight settings Power Source: 1 x CR123 battery Battery Life: 1,000 continuous hours at nominal setting 12 at room temperature Operating Temperature: -40 F to 140 F (-40 C to 60 C) Country of Origin: Made in USA