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

I used these as a prank wired up to a button to scare my boss It worked for anyone that is wondering and he jumped They make a high pitched hum/buzz I wired it up in line to a 9V battery it was super easy

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.

I wanted a better sound for the key buzzer for my AW11 MR2. This offers a much better and more modern sound, and was easy to integrate into the buzzer box. It felt well made and was easy to solder in place. Much better than before!

This sonalert buzzer works well in my electronic project. I used 5v power supply and it works perfectly.

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.

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