The Bushnell Tac Optics Mini Cannon is a dynamic red dot in a compact 3-inch package with an unlimited field of view. Black with Dot, Circle Dot, Crosshair Dot, Circle Crosshair Dot reticle Waterproof Construction - O-ring sealed optics stay dry inside, even when totally immersed in water Shockproof construction - Built to withstand bumps, bangs, drops and the rough-and-tumble environment of the field Nitrogen Purged Fog-Proofing - Nitrogen inside the scope ensures interior optical surfaces won't fog due to humidity or rapid temperature change 12 Brightness Settings Extended battery life Nitrogen purged