Are you going on vacation and want to know if your hotel room is really as clean as it seems at first glance? Then this UV flashlight is perfect for you! To use the flashlight, you need 3 AA batteries (not included). Then you turn on the flashlight with the on and off button. You will now see things that are not visible to the naked eye. The flashlight also works in the hotel, at your vacation destination, a restaurant, or at home. The UV light is also suitable for checking banknotes, ID cards, and passports. The possibilities are endless! The flashlight operates on 3 AA batteries (not included).