The special gel in this pen appears as a dull slightly-visible orange in normal light, but glows a brilliant orange when you point the attached blacklight LED at it. This pen is not just fun for writing secret messages to your BFF, but the coiled blacklight is perfect for door staff at events too. Check IDs and money for authenticity, make private notes on the guest list that patrons can't see without blacklight, cross off guest list names using the gel pen while still being able to read the original names, and more. The larger barrel of this pen makes it easy to hold in fast-paced environments. The coiled blacklight can be pointed where you need it without having to turn the pen over. The thick clip means you can attach this to your jacket without fearing losing it. An on/off switch for the LED means you only have light when you want it. Comes with 3 long-lasting AG13 batteries pre-installed (not replaceable). The barrel of the pen comes in assorted solid colors.