The yellow gadgets on the Ghostbusters' belts are "PASS Devices", real safety devices used by firefighters all over the world at the time of this production. The device emits a loud alarm if it doesn't detect movement after a predetermined time, for example if a firefighter is knocked unconscious or trapped. They have since been incorporated into the self-contained breathing apparatus worn by firefighters, and may include thermal sensors which sound an alarm when temperatures rise rapidly.

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