Hey Spy Ninjas! We are a team of best friends who create videos of our daily action-packed adventures. We use martial arts and detective skills to find clues and solve puzzles to defeat our enemy – evil hacker organization Project Zorgo, who intends on taking control of the internet! Send secret messages to your friends with the invisible ink Secret Message Spy Pen! Product Features: Includes: Secret Message Spy Pen, Decoder Wheel, Spy Ninja Notebook & Pencils, as well as secret messages! The pen has a regular ink pen, an invisible ink marker, a secret message compartment, and a UV light for revealing the hidden message! Batteries Included (3 x LR41) Suitable for ages 6 years + Specifications Batteries Required: 3 x LR44 (included) Manufacturer: Character Options Manufacturer Number: 41151 Our Product Number: 553245 Safety Information: Not suitable for children under 36 months