This pen is very very special & COOL! When you write a message on a paper, clothes or your body, nobody can see it. It just can be seen with a LED(UV light). If you write some messages on your body or clothes and go to DISCO, everybody can see your messagesfor UV light in the disco. New amazing adventure begins now.

Features:

• Powered by three button cell AG3 (included) and for reading the invisible message and detecting counterfeit banknote.
• Detect counterfeit money (blacklight shows watermarks)
• Great stage property in a spy game
• Be cool at school and before your friends!
• Great children's sleep over and camping fun!
• Makes a memorable party for kids
• Color: Blue

Functions:

• Hidden secret messages
• Money/ visa card counterfeit detection(can see the watermark)
• Emergency light
• Security marking

Note: Not for children under 3 years: small parts have choking hazard. If pens appear dry, just dip tip in water.