Invisible Ink Pen, Spy Pen Secret Message Writer with uv Light Magic Marker for Drawing Fun Activity Kids Party Favors Ideas Gifts and Stock Stuffer (24pcs)

Invisible Ink Pen, QIYO Spy Pen Invisible Ink Pen with UV Light Magic Marker for Secret Message Features: Spy pen comes in a pack of a variety of colors Yellow, Purple, Blue and Red,This pen makes a great gift for your Students, your Neighbors, Birthdays, Surprise parties & more! Harmless and flavorless ink,healthy. PLEASE DO NOT use on some special surface, like: glass or smooth plastic film, etc; it will influence the effect, and easily to be erased. Permanent but washable easily. This Spy pen also has a UV light on the opposite end. To operate it all you have to do is turn your pen to the opposite side, push the flashlight button, and voila! A blue color UV light will shine and reveal your message. The flashlight runs on three button-cell batteries. The uv light on the pen can also be used as the currency checking tool.