This klaxon horn with chrome trumpet recreates the genuine old OOO-GAAHH sound. Polished metal body and a substantial plastic-chrome horn. It is 235mm x 120mm overall, and the horn section 120mm x 77mm diameter. 12volt 2-terminal connection. Makes an excellent boat or yacht horn. Requires a single 6.5mm hole to fix and the bolt included. Made in Italy, the home of loud horns!