HDE Mini 21 LED Black Light UV Ultra Violet Detection Portable Flashlight for Stains and Counterfeit Detection Small lightweight and compact design makes easy to travel or carry anywhere Perfect inspection tool for cleanliness of hotel rooms, counterfeit bills, scorpion spotting, and bed bugs Can detect items the naked human eye can't; LED bulbs are energy efficient to conserve battery life Built in LED flashlight provides additional seeing options in the dark Size: 3.5" ; Power Source: 3 X AAA Batteries (Not Included)