Federal Signal Vibratone® Electronic Horn, Compact Heavy-Duty, Series: 350, 120 VAC, 0.18 A, 50/60 Hz, 100 dB, Indoor/Outdoor: Indoor/Outdoor, Specifications Met: ARRA Compliant|BAA Compliant|CSA Certified|cUL Listed|FM Approved|UL Listed, Panel/Surface Mount, -65 to 150 deg F Operating, Die Cast Zinc, Gray, 4.06 in W x 2.19 in D x 4.06 in H