Includes an ultraviolet light or fluorescent detection of fraudulent documents and for use in forensic investigations. 375 nm ultraviolet LED High-intensity LED lasts 100000 hrs. Powered by 3 AAAA alkaline batteries Runs up to 60 continuous hours Momentary blink and consistent on modes Serialized for easy identification Pocket clip for easy access 6.21 in. 1.1 oz. Ultraviolet Info in the Learning Center.