This portable UV black light can be used as a torch and a money detector within a powerful mini flashlight built-in. Light weight and easy to use. Dimensions: 16.3 x 5.6 x 2.2 cm Weight: 3.1 oz. Long wave UV light, not harmful to your eyes. Power Supply: 4 AA batteries (not included). Verify hidden security features on banknotes and passport. Check watermarks and security strips. Check paper quality on security documents Highlight alterations and staining.