Explosion-Proof Vibrating Horn 120VAC - Available in 120VAC and 240VAC. Corrosion-resistant cast aluminum housing. Produces 100 dBa at 10 feet (110 dBa at 1 meter). 3/4" pipe or surface mount. Rated for Class I, Division 1, Groups C and D - Class II, Division 1, Groups E, F and G - Class III. UL and cUL Listed, CSA Certified.