5Pcs SFM-27 DC 3-24V Electronic Buzzer Alarm Sounder Continuous Sound Beep (Pack of 5) CYT1083

I used one of these to make a long-reach continuity tester. With 5 or 6 meters of 22 AWG wire and associated resistance, I figured it would take something in the middle of the rated 3V to 24V range. However, I started with a 3V coin cell battery, and got a nice clear sound, plenty loud enough for the application. (Can't imagine what an ear-piercer it would be at 24V.)It emits a beeeeeeeeeeep with no buzzer-ish sound. Didn't measure the pitch.

I used one of these to connect to a keyless entry system of a car so that it makes a subtle beep when you press the unlock or lock button. It makes a nice beep sound with 12v of power. I was worried it would be too loud or too quiet for the application I was using it for, but it turned out to be just perfect. I did notice that all 5 of the piezo buzzers make a slightly different tone with the same amount of power, which could be good if you wanted a slightly lower or higher tone in the beep.

Works, but louder than expected. Used to replace broken speaker in my driveway alarm.

Needed interior sounder as night time alert while sleeping since push notifications on phone don't always wake me up. Volume of the Sounder is controlled by the variable voltage range of the power supply input to the device. I'm using 5VDC and this has plenty of level to awaken me as it's located in my bedroom. The device uses 3 to 24 VDC for power and I imagine the 24VDC volume level would be impressive.

I attached this to a 9v battery. Everytime I want to drive someone insane I'll hide it 🙃

I bought these buzzers to remind me when my turn signals are flashing on my Kawasaki Vulcan motorcycle. Unfortunately, this model doesn't have self-canceling turn signals. The buzzers work fine so far and they're loud enough for me to hear, even when they're mounted under the seat and the engine is running. My only criticism is the ultra-skinny wires they use. It's really difficult to connect them to other wiring and they can easily be broken or dislodged if not mounted very carefully. I would have gladly paid more for a sturdier design.

Wired one of these to a proximity sensor and wow are they loud! A little louder than a standard smoke alarm.

Installed one of these in my 1997 SEADOO GTi to replace the factory one that stopped working.These are smaller than the factory buzzer so I enlarged the holes to fit a standard zip tie and drilled into the SEADOO plastic to mount it fairly securely.I’d say this is half as loud as the original buzzer as well.This isn’t waterproof so I sprayed silicone on the inside to hopefully have it last longer.Even if it just lasts a season I’m happy with a pack of these costing way less than a new factory style buzzer.