Federal Signal 640000 Siren, 640 Series, 100 W, programmable slide switch and light control Category_Anti-Slip Tape and like most things German

and like most things German they're out-standing quality

12 Blue LEDs

Because vibration sensitivity can shorten the life of both a temp switch and your equipment

Dimensions         5

2" NPT Drum connector

Federal Signal 640000 Siren, 640 Series, 100 W, programmable slide switch and light control Category_Anti-Slip Tape and like most things GermanThe Federal Signal Model PA640 (figure 1 1) is a precision built, efficient and economical full featured electronic siren and light control system. The siren provides wail, yelp, and priority or high low siren tones as well as the horn ring transfer Tap II feature, public address (PA), radio rebroadcast and an air horn sound. On board relays in the unit allow centralized control and wiring of primary, secondary, alley lights, and auxiliary circuits