Children & adults will love the secrecy found with the Secret Message Pen. Prying eyes can be prevented from seeing what you write by using the Secret Message Pen. The ink that is used to write is invisible until it is viewed with an ultra violet light that is included. It takes security to a new level. Perfect for yourself or for gift ideas for friends & family. You will have plenty of writing time, also with the addition of two spare refills. Features Include: Ultra violet torch Included 2 spare refills