Red-Illuminated patented ACSS Vulcan Dot Reticle System; Ultra-compact size for concealed carry applications; Two Reticle Settings: Dot + Circle, and Dot only; Shake Awake – Motion on with last setting recall; Parallax-free, unlimited eye relief; CNC milled 7075 Aluminum Housing; 10 daylight and 2 night vision compatible brightness settings; IP67 Certified