The Belt Gizmo is an equipment of some sort that can be found on the left side connected to the Belt.
The Belt Gizmo as a walkie-talkie, during the Sandman incident. Peter used it in a hallway before going under Sandman's sleeping spell. During the Headless Horseman incident, Winston used it to communicate with the others. Ray used it during he Spookums incident. During the fairy tales made real incident, Egon got a warning on it after The Giant's Son and The Giant captured Peter and Winston with Ecto-2. In both cases the yellow light goes off and an audible alert is heard. In one case the LCD screen was used.
Unlike the unexplained film version, the animated Belt Gizmo was used several times on The Real Ghostbusters and functions as a communication device. The device didn't appear in Extreme Ghostbusters, even in the two part Back in the Saddle, Part 1 or Back in the Saddle, Part 2.
- Ghostbusters Get Real