Exchange secret messages with your siblings and friends with this 2-IN-1Invisible Writer Pen! Each pen has a black light in the cap so you can read messages written with the invisible ink. As an added bonus, each pen can also write like a normal blue ink pen.  Perfect for your secret diary or school notes to friends! 

• both invisible ink and regular black ink.
• Requires three AG10 batteries (included).

Recommended for ages 5 to 85!