looking for a battery operated horn

Hi, hoping somebody out there might be able to help me out. I’m looking for a horn for my bike have found compressed air types (uses a bottle fitted in one of your cages) frankly these are too loud plus you have to keep them pumped up. The only batt operated one I’ve seen is the fireman Sam one in halfords Which is badly made, cheap and tacky. Surely there must be a manufacturer out there.
Thanking you in advance Bob