LED (Light Emitting Diode) 100% Safe for the Eyes. Unlimited Eye Relief for flexible mounting. Rheostat Knob with Five Brightness Levels for each of the Red and Green Dot reticles. Includes 30mm Cantilever weaver/ Picatinny type Mount. Ocular and Objective Flip-Up Lens Covers. Powered by 3 Volt Lithium Batteries (CR2032) included. Includes Extra Battery and Mounting Tools. Black Anodized Aluminum Body.