The DLB140R is not only a red dot scope, but it has an integrated red laser on the side. This adds sighting options not found on other red dot sights. It features a black anodized aluminum body, unlimited eye relief and field of view, integrated quick release 3 inches weaver-style mount. The side mount external<,5mW laser sight is fully adjustable with beam power of 635-655 nm. The sight and laser can be used together or individually, and are powered by CR2032 lithium batteries. 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 V lithium batteries (CR2032) Built in fully adjustable laser sight Five brightness settings for red dot sight Ability to use red dot or laser individually, or both at the same time