LED (Light Emitting Diode) 100% safe for the eyes. Unlimited Eye Relief for flexible mounting. Mechanical On and Off switch mounted to the rear of the optic for easy access. Includes Micro Dot plastic cover, tools for mounting & zeroing the optic, and a spare battery. Micro Dot heads-up display Reflex Optic with Red Dot reticle allows the shooter a wide field of view to quickly acquire and aim and engage their target. It's small and compact size allows this Reflex Optic to be mounted virtually anywhere on a rail or even on a Primary Optic like a scope.