Set of 2 invisible ink pens by Rex London.
Write secret messages with friends with this magic pen duo. The writing will be revealed with the torch in the pen lid.
Each pen uses 3 LR41 lithium batteries which van be replaced by unscrewing the top section of the pen.
Warning:
- Button batteries are easily swallowed and can cause serious harm.
- Check battery cover is secured correctly before use.
- Keep batteries away from children.
- Not suitable for children under 3 years of age.