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