Stebel 11690062 - Nautilus Compact Tuning Marine Mini Air Horn Unique 1pc Sealed Compact Mini Air Horn design in a white ABS finish with a sealed compressor Harmonized twin tone sound (530Hz and 680Hz) at 139dB Compact size for easy installation (5" x 3 1/2" x 4 1/2" tall) with a water Tight Compressor: 18 amps at 12volts Especially made for marine applications but will work with any 12v system