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Rex London Secret Agent Invisible Ink Spy Pens (S2)
Invisible Ink Spy Pens - A fun gift, budding secret agents can use these 2 pens to write messages which can only be seen under the pen's UV light.
Step 1: Write a secret message
Step 2: Use the secret lamp in the pen lid to read the message
Each pen uses 3 LR41 Lithium batteries which can be replaced by unscrewing the pen lid. Remove the white caps from the pen nibs before using for the first time
Warning:
- Button batteries are easily swallowed and can cause serious harm.
- Check battery cover is secured correctly before use.
- Keep batteries away from children.