Product Review

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.