Vibratone Horn, Indoor, Voltage 120VAC, Amps 0.18 AC, Gray, Decibels 100dB @ 10 ft., Height 4 In., Width 4 In., Depth 2-1/2 In., Housing Material Die Cast Zinc, Mounting Surface, Flush or Semi-Flush Walls, Panels, Operating Temp. -65 Degrees to 150 Degrees F, NEMA 4X/12 Rating, Standards UL E4813, CSA 00583X, FM