A magic pen with invisible ink that appears when illuminated by UV light, hidden in the cap. It has an on/off button. It works with 3 included LR44 HD batteries. Recommended age: from 8 years. Attention! This is not a toy! It is not suitable for children under 3 years of age, there is a risk of choking due to the small parts. Country of origin: K.L.R. Made to French design and order.