Dual trumpet electric horn - bright polished stainless steel 304 non-magnetic grade.   For exterior roof mounting on trucks, vans, RV's and boats.  Produces a powerful dual trumpet sound that is sure to be heard.  The Commander is ideal for any 12-volt electrical system, does not require a compressor or hoses and is maintenance free.  Designed to give years of dependable service in any environment including salt water.  Includes a stainless steel adjustable trumpet support to prevent vibration.  Comes complete with rubber gasket and stainless steel mounting hardware.