Wolo's Persuader electric low-tone horn is manufactured from 100% stainless steel and features a 304 nonmagnetic painted white finish that will not rust. Designed for exterior mounting on boats in salt or freshwater environments, the horn is ideal for almost any weather condition. The maintenance-free Persuader does not require a compressor or hoses, saving you time and money. Includes an adjustable trumpet support to prevent vibration. Horn comes with rubber gaskets, stainless steel mounting hardware, and installation instructions in English/Spanish. 4-amp current. 115 decibels. 330 Hz. 18-1/2"L x 4"W x 4-1/2"H.