Validate identification instantly. Powerful LED ultraviolet light reveals security markings. Compact, handy tool is excellent for checking international currency, passports, driver's licenses and IDs, traveler's checks and more. Operates on AAA batteries. Counterfeit Bill Detector Type: UV Light; Watermark; Counterfeit Indication Mark: Ultraviolet Security Strip; Currency: Most Foreign Currencies; U.S.; Color(s): Black/Silver.