Features: Portable and handheld, convenient for use and carrying. 2 in 1 design, used as UV light currency detector and torch lamp. Verify security features on banknotes and passports. Powered by 4 * AA 1.5V batteries(not included), easy to use. Also can detect foreign currency, passport, bank draft, check, value-added tax invoice, etc. How to use: Slide the side switch towards TUBE to switch on the UV lamp; Slide the side switch towards TORCH to switch on the white lamp; To switch off side switch to the center position; Replace the batteries when the lamps begin to dim; Operating with low batteries may damage the lamp; Do not slide the side switch to the tube position with the UV lamp removed, which may damage the UV lamp drive circuit; Remove the batteries when the lamp is not to be used for some time.