Specifications: 254nm shortwave and 365nm longwave UV lamp for fluorescence detection on stamps and banknotes. Note: 4 AA batteries (not included). This longwave lamp reveals various types of fluorescent and colored bands on GB stamps (refer to illustration for blue and yellow). It is also effective on stamps from Australia, Canada, China, France, Germany, Hong Kong, Mexico, Norway, and Russia. The lamp can help identify different paper types, including OCP, FCP, PCP, and ACP. For optimal results, use in a dimly lit room against a dark background. This handheld portable model requires 4 AA batteries. Shortwave lamp: This shortwave lamp clearly shows phosphor and phosphor afterglow on GB stamps up to 1992. Best results are achieved when used in a dark room—the darker the environment, the better the visibility. To observe different colored phosphors on the 1960 Wildings issue, look for the phosphor afterglow immediately after turning off the UV light. Green phosphor has the brightest afterglow (10 seconds), followed by blue (15 seconds), while violet has a very short afterglow (5 seconds). Afterglow effects are difficult to see in daylight; a dark room is recommended. This handheld portable model requires 4 AA batteries (not included). Condition: 100% . Manufactured in China. Package included: 1 x 365nm longwave UV lamp 1 x 254nm shortwave UV lamp