LED (Light Emitting Diode) 100% safe for the eyes. Unlimited Eye Relief for flexible mounting. Large 40mm Objective lens for a wide field of view. Adjustable Quick Release Mount fits virtually any weaver/Picatinny type rails. Integrated Red (Class IIIa) Laser that is fully adjustable for zero. Powered by 3 Volt Lithium Batteries (CR2032) included. Includes Extra Battery and Adjustment Tools. Black Anodized Aluminum Body.