Sentinel Ultra-Compact Micro Reflex Dot Sight - Sentinel Ultra-Compact Micro 1x16mm Red Dot Sight Auto Adj

IN THE BOX: Optix w/sheath, screwdriver, lens cloth, Battery, and three screw sets. AUTO BRIGHTNESS MODEL: A photosensitive sensor on the left side of the body provides dot brightness relative to ambient light conditions. The brightness adjustment is always on. COMPACT UNOBSTROCTIVE FIT: Shoehorned into this tiny scope is a 16mm x 16mm window, big enough for fast acquisition and sight tracking but small enough that it doesn't affect concealment. DUTY GRADE: Made from 7075 aluminum that is hard coat oxidized, shock proof to 1,500 G forces, and waterproof. DOUBLE THE LIFE: The CR2032 battery effectively doubles the battery life. Whether you choose Sentinel-M or Sentinel-A, expect two years of real-world battery life, even carrying your pistol all day, every day.