Pactrade Marine Boat Stainless Steel Dual Trumpet Horn 12V Heavy Duty Stainless steel profile. 400 hz, 350hz and 105db 115 db. at 1.4 meter Operates on 12 vdc and 10a Comes with anti vibration base rubber Does not require compressor nor hose to function, hassle free installation Dimensions: In inches: 18 1/8" by 8" by 5"h