Invisible Laser Light Pen
The ink is invisible after you write with it,unless you light on the cap blacklight to see the secret message perfectly.
Invisible Ink Pen: Harmless and flavorless ink, healthy toys for your children! Smooth and colorful disappearing inks on Shirts, Garments, Pillows, Skin, Papers, Other Fabrics and any surface! Permanent but washable! Good choice to be included as a return gift for birthday functions, nursery gatherings, Farewell parties.
The unit contains batteries inside it. Recommended for children above 3 years.