Stebel Nautilus Compact Black Mini Air Horn with Cover Full ABS Black cover to cover the compressor and give a beautiful finished look Unique Compact Mini Air Horn design 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, )