Federal Signal 640000 Siren, 640 Series, 100 W, programmable slide switch and light control Fluorescent Vibration Rated to withstand 10g

Vibration Rated to withstand 10g per Mil-STD-204

DOT-C2 Certified – Meets all applicable DOT and SAE specifications for commercial vehicle safety

Typical uses include truck air intake systems

They aren't the cheapest ones

Federal Signal 640000 Siren, 640 Series, 100 W, programmable slide switch and light control Fluorescent Vibration Rated to withstand 10gThe 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