remote button activated waterproof horn recommendations

[wojtek]

im looking for a reliable powerful and waterproof horn for my velomobile. Airzound is great but i think it requires a lot of work to change the valve to make it remote control.

any recommendations please?

EDIT: i was playing around with the wire brakes, i think it could work this way [pulling the cable with the brake handle activates the horn...]

But might also be quite a work to make it proper!