Have you got a secret that you don't want others to read about? Write it down with this invisible ink spy pen and only you can read your message with the LED blacklight flashlight tip. Also great for checking IDs or currency, illuminating glow-in-the-dark and UV-reactive items, and spotting icky urine stains. Uses 3 replaceable AG10 batteries (included).
Please note: the actual blacklight has a normal steady-on/off function and does not "flash" like pictured in the above manufacturer-supplied animation.
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