Specifications: 254nm Shortwave and 365nm Longwave UV Lamp for Fluorescence Stamps & Banknotes Note: 4 AA batteries (Not included) This long wave lamp will show you the different types of fluorescent and coloured bands on GB stamps (see illustration for blue and yellow). It will also work on stamps from Australia, Canada, China, France, Germany, Hong Kong, Mexico, Norway, and Russia. This lamp will also detect different paper types, i.e.: OCP, FCP, PCP, and ACP. For best results, use in a dimly lit room against a dark background. This handheld portable model requires 4 AA batteries. Short wave Lamp: This short wave lamp will clearly show you the phosphor and the phosphor afterglow on GB stamps up to 1992. For best results, use a short wave lamp in a dark room; the darker the room, the better. To see the different coloured phosphors on the 1960 Wildings issue, observe the phosphor afterglow when you turn the UV light off. Green phosphor is the brightest (10 seconds afterglow), followed by blue (15 seconds); violet has a very short afterglow (5 seconds). It will be difficult to see the afterglow in daylight; the darker the room, the better. This handheld portable model requires 4 AA batteries (Not included). Condition: Package Included: 1 x 365nm longwave UV lamp 1 x 254nm shortwave UV lamp