These are great pens to write any secret messages and clues for others to find.
This magical, invisible ink pen will write your secret message and be completely hidden to the naked eye!
Once your secret message is written with this pen, wait a few seconds then shine the light from the cover of the pen ...
This item has made timing so much easier for us! We have them inside the rooms as well as on the outside so that each room is well synced!
It is multi-functional with a time display in two modes - 12 or 24 hour displays, you can just push the MODE button to change it.
There is a calendar and temperature ...