This dual function black light is perfect size for a purse or a coat pocket. It has a built-in flashlight beam as well as a standard black light tube. It can be used to illuminate anything that can be seen under black light such as our Invisible Marking Pen or Thief Detection Powder to detect your personal property. You can also use it to inspect paper money for counterfeit. Operates on 4 “AA” Batteries (Not Included). 6 x 2 x 3/4 inch3. Plastic color may vary.