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) x 1.4" (W) x 2" (H) Run Time 60 minutes Power 80-90 lumens Special Features Momentary or constant on switch. Safety switch prevents inadvertent operation. Gun Type (with rails) For S & W SIGMA series