100% stainless steel exterior, Type 304 stainless steel diaphragmMaximum amp draw: 7 ampsdB(A) rating: 110 at one meterFundamental frequency: 460/-15, 415/-15HzDimensions: 16" L x 7.5" W x 4" HCOMPACT DUAL TRUMPET ELECTRIC HORN is 100% stainless steel exterior. Type 304 stainless steel diaphragm. 12 volt DC. Prewired. Size is 16 "H x 7-1/2"W x 4"H.