I'm a fan of the mouth-powered version. Maybe it's my Healthy Lifestyle (KOFF! KOFF!) but I have no problem blowing it as loud and as long as necessary, and it seems at least as loud as any air-powered horn, and louder than the electronic ones. AND it can sit for years and still work when you need it. Also, you can point it where you want to, whereas a permanently-mounted horn only blows in one direction.
If you're lazy, I also have the pump-up air-horn ones.
druid
If you're lazy, I also have the pump-up air-horn ones.
druid