|Quoting MCOflyer (Reply 2):|
For those not familiar with this topic, please post a picture of the object in question.
Don't have a photo, but it's really easy to picture. Red pass is just a plastic security pass with your picture, number, expiry date, and some fancy computerized crap stored in it that has your biometrics for scanning in to get access to the restricted area and to unlock the doors that require a security pass to get through. Basically it's like a piece of photo ID
that can open doors leading to and within restricted areas at the airport.
It has to be visible at all times in restricted areas, so they give you a clear plastic pouch with a little clip on the top so you can clip it onto your shirt/jacket/whatever.