EOTech's Model 512 Holographic Weapon Sight uses advanced technology holography to reconstruct the reticle image in the Heads-Up Display window. It is waterproof, fog-proof, shock-proof and withstands extreme temperatures. The HWS remains fully operational even when the window is blocked by mud, snow or rain. Using an HWS on your firearm means you can shoot without the blind spots, constricted vision or tunnel vision associated with tubed sights. The HWS does not emit any side position-revealing light signature - the projected reticle pattern is visible only to the operator. And the reticle is always clearly visible, even against light targets in full sun, with no washout as seen in red dot sights.