The Duty is a rugged, closed emitter pistol optic that is sealed and ready for duty. Never worry about dirt, dust, or water clouding or disrupting your dot. This side-clamping optic is sure to be the best companion for your duty, carry, or competition gun. It is available in red, green, and multi-reticle versions.Features : 3 MOA Dot and 30 MOA Circle Battery Type: CR2032 Shake Awake 10 Brightness Settings 2 Night Vision Settings Auto Shut Off ACRO Footprint Reticle Color: Red Requires Adapter (Not Included)