The WOLO European style all-metal horns with a chrome grill are replacements for horns found in many German luxury vehicles. The Model 306-2T is a universal replacement set (1 high tone / 1 low tone), 12 volts 2 terminal. Made of heavy steel throughout to give years of dependable service. Easy to install into any 12 volt vehicle and supplied with a easy to use mounting bracket. 115 Decibels, 6" diameter. If you're looking for a louder sound this is the horn you're looking for!