NSITA725 Light Duty and General Purpose Buzzer with Switch, 8-16 VAC, 3-6 VDC, 1 Amp Current, 2-1/2" Width, 3" Height, 1" Depth, Ohm

Loud. Just what I was looking for. The piezo buzzers are way too weak.

This Saved me a lot of problems.The door buzzer at my Wife's store had died and it is an old buzzer system.I was dreading having to replace it when I found this which is exactly like the original.I hooked it up and it works perfectly. A bit loud for my taste but it does get the staffs attention.

We have mice that moved into one of our outside walls. My HOA takes a little while to get the exterminator going and I decided to take matters into my own hands by giving the mice a headache. I attached this buzzer to a block of wood, which then I carefully have attached at intervals to different areas on my cove base. Running on 5 volts from a repurposed power adapter, it produces a satisfying loud hum, and makes the wall vibrate. At first the critters moved, so I followed them. It sounds like they're gone now.

I really liked the idea of having a buzzer ringing vs. a bell style. This did not work for our usage and wished it did.

The media could not be loaded. I have tried it on both AC and DC voltage. This is 6vdc in this video. It’s loud but not too loud. It will definitely get your attention.

Came quick looks good haven’t used it yet so I’ll let you know

took a few tries from maintenance and we finally had to give up. I should return it -- it's still a ding dong not a loud buzzer which I needed

They work great. Incredibly loud, though. Louder and more startling than I thought it would be. I tried to attach a piece of acoustical felt to it, so it would absorb sound. It didn’t work. But the unit itself works great!