Magic pen whose paste is invisible to the naked eye and the writing is visible only when illuminated with the flashlight at the end of the cap (UV). The pen works with 3LR44 HD batteries, which are included in the set. Recommended age: + 7 years. WARNING! Stationery item. Not a toy. Contraindicated for children under 3 years. To be used under the direct supervision of an adult. Manufacturer: Djeco, France