Stebel 11690039 - Nautilus Compact Mini Air Horn Chrome Unique 1pc Compact Mini Air Horn design in an Automotive chrome ABS finish Harmonized twin tone sound (530Hz and 680Hz) at 139dB Compact size for easy installation (4 1/2" x 3 1/2" 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, )