Streamlight M-4 is built for the Smith & Wesson SIGMA series with rails as well as other popular brands. A slide allows instant attachment and detachment from the weapon, and a powerful halogen bulb and two 3-volt lithium batteries provide fully adjustable, brilliant white light. Momentary or constant on. (Batteries are NOT included).

Battery: Two 3-volt lithium. Lamp: Halogen . Material: Chemical-resistant polymer. Tempered glass lens for easy cleaning. Color: Black . Weight: (with battery) 4.0 oz. Dimensions: 3.4"" (L) x1.4"" (W) x 2"" (H). Run Time: 60 minutes . Power: 80-90 lumens . Special Features: Momentary or constant on switch. Gun Type: (with rails) For S & W SIGMA series.