Tactical Red Laser Sight with Flashlight and Mount, includes riser bar. Improve accuracy in the dark with this must have system that combine the precision of a laser sight with the illumination of a high intensity flashlight, leaving no doubt in your mind where your shot is headed. Specifications: Tube Diameter (mm): 19 Output power: Wavelength: 635-655nm Max Reach Capacity: 500 yds Adjustment Type: Allen Wrench Battery Type: CR-123A LR-44 Lithium