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 reticleWaterproof Construction - O-ring sealed optics stay dry inside, even when totally immersed in waterShockproof construction - Built to withstand bumps, bangs, drops and the rough-and-tumble environment of the fieldNitrogen Purged Fog-Proofing - Nitrogen inside the scope ensures interior optical surfaces won't fog due to humidity or rapid temperature change12 Brightness SettingsExtended battery lifeNitrogen purged