Viridian Reactor 5 Gen 2 Red laser sight for Glock 19/23/26/27 w/ECR/IWB HolsterThe new Reactor R5 R Gen 2 Red Laser Sights feature upgraded circuitry and other improvements from previous models. The affordable and versatile red laser is powered by two 1 3n batteries and comes standard with an INSTANT ON ambidextrous custom microfiber IWB holster with automatic laser activation upon draw. No buttons. No squeezing. No doubt. Available for most leading and recently introduced compact pistols including the latest from Ruger,