The HWS EXPS3(TM) is an excellent choice for professionals. The EXPS3 offers true two eyes open shooting for fast target acquisition, night vision compatible settings, and a 7mm raised quick detach base for lower 1/3 iron sight co-witness. FEATURES: Night Vision Compatible 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 33ft. (10 m) depth Mount 1" Weaver or MIL-STD-1913 rail Windage & Elevation Adjustment 0.5 MOA per click Brightness 20 daylight settings 10 additional settings for Gen I through III+ night vision devices Power Source 1 x CR123 battery Ba Mfg: Eotech