The Key Fob is a strap with a ring that can be found on right side of the Belt hanging. While not used much, it was used in Knock, Knock to hold the P.K.E. Meter for Egon.
The key fob didn't appear in Extreme Ghostbusters, even in the two part Back in the Saddle, Part 1 or Back in the Saddle, Part 2.
Gallery[]
Primary Canon[]
A Key Fob in use holding a P.K.E. Meter in place while Egon walks
Particle Thrower on Key Fob seen in "Future Tense"
As seen in "You Can't Teach an Old Demon New Tricks"
Secondary Canon[]
As seen on Ghostbusters: Get Real Issue #2 Regular Cover