In a modern reflex red dot sight, a battery is used to power a single LED. This LED projects either a red or green light onto a concave lens. Thanks to a special coating, that illuminated point becomes visible to your eye.

How long does a reflex sight battery last?

New advanced battery technology gives up to 3000 hours on bright setting and up to 40k hours on Low setting with a 2032 Battery(Included). Top load system, no need to remove the sight to change the battery. The length of this red dot is about 30% longer than other traditional micro/handgun red dots.

Whats the difference between a red dot and a reflex sight?

A true red dot sight is a reflex sight enclosed in a tube. They offer a brighter reticle than open sights and open reflex sights provide a wider field of view and unlimited eye relief. Open sights are better for faster target acquisition and are more comfortable for aiming with both eyes open.