12 volts compact Size Loud Air Horn at loud 110 decibels. Compact size that allows it to be easily installed in any tide space under the hood or at your existing horn mounting location. No tubing to hook up. Compressor and trumpets are all combined in one compact unit. Loud dual tone (high/Low) sound. Easy 2 wire installation instructions included. will fir most 12 volts vehicles, such as: cars, trucks, SUV's, Pick-Ups, Boats, RV's, and many more applications.