Sonic Mini Compact Horn - Chrome These Sonic Mini Compact Horns feature ASA plastic covers for impact and UV resistance. Mounting bracket can be used as a wiring template. Horn wiring has no polarity, so the negative or positive wire can be attached to either side. When installed, horns should point slightly downward to permit water drainage. At 108 decibels and a frequency (Hz) of 440 20A, this horn meets US Coast Guard's COLREGS and ABYC standard A-23 for use on vessels under 12m (39'). 12VDC. 12VDC.WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.