A useful tool for clear inspection under any conditions. Illuminates the bore fully, so nicks, scratches, pits and fouling can be seen easily. Good for safety checks and for lighting hard-to-get-at areas. Locking feature can lock light on for longer inspections. A good tool to take along if you are buying a used firearm. Uses two AAA batteries (not included). Manufactures Website Address www.hoppes.com Warranty Information Warranted against manufacturers defects.