It is a large electronic horn but only on one side. Sounds a lot like the Quad installed on my Valk. Not nearly as loud as Mark T's train/fire truck air horn he has installed on his bike.
http://www.horseapple.com/Valkyrie/Tech_Tips/Train-Horn/train-horn.htmlI wanted to put his on the Green hot rod Valkyrie Interstate that had the pods taken off, but got talked into selling it last year before starting that project. Would have loved to use that horn when preoccupied drivers tried to invade my lane. If I had room for a nice Standard in the garage the horn would fit on one of those.
Sure hoping she takes to this Valkyrie trike. It is a Lot cheaper than the Can Am Spyder's some of our riding partner's wife's have been riding. They look and ride nice but I'm just leery of buying a bike that is not a Honda.