The Vism Compact Pistol Green with Strobe feature is designed to fit full & compact sized pistol accessory rails (~1.7 in-2.0 in). The compact green can also be mounted onto long accessory rails and handguards. It features a low battery condition with a red LED on the side of the body. It has a black anodized aluminum body and uses 2 CR1/3 N batteries (included).