Federal Signal 55-120-1 Electric Resonating Horn, 120 VAC, 0.75 A, 115/105 dB Sound Level, Gray, Specifications Met: CSFM Approved, UL Listed, cUL Listed

The Federal Signal Models 55 and 56 are electric horns that produce sound by means of a diaphragm, which resonates a column of air. Because the output is greater than that of a vibrating horn resonating horns can be used wherever a louder, more powerful signal is required.