Stebel 11690058 - Nautilus Compact Truck Mini Air Horn Unique 1pc Compact Mini Air Horn design in a black ABS finish Deep, single tone sound (300Hz) at 134dB Compact size for easy installation (5 3/4" x 4" x 4 1/2" tall) with a water Resistant Compressor: 18 amps at 12volts Will work with any 12 volt system (car, truck, motorcycle, golf cart, RV, bus, Rhino, Gator, ATV, boat, Hi-Lo, )