+2 for a real horn.
That's the first farkle I add on all my bikes: Stebel Nautilus. If there's not room for the rather large device under the tupperware, I mount it on the side of the right fork, so cars in the No. 2 lane can damwell stay there!
Plus, if you very quickly tap the horn button, it doesn't get blaster loud and is useful in the city for pedestrians and folks sitting at freshly green lights talking, texting, eating lunch, consulting their GPS, picking assorted orifices, etc.
Bill
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"Everybody's got a plan, until they get hit." -- Mike Tyson