2 PCS Piezo Buzzer, Icstation Buzzer Alarm 12V Electronic Beep Buzzer 100dB Piezo Alarm Siren Continous Sound for Motorcycle Golf Cart Vehicles Car Alarm

Used them as warning that the car headlights are on when I leave the car, they work very well for that, with exception that they are quite loud, would be nice if there were a adjusting screw... I dampened the loudness a little by putting tape over it. Near as I can tell it is a very good product but time will further inform me...

Both worked perfectly as doesn’t always happen when you get foreign stuff in pairs. Problem was they were too loud. I intended to wire these (at least one of them) to my turn signal flashers in my old truck as I’m hard of hearing and my blinkers don’t cancel on their own. I have an old Radio Shack buzzer wired up to an old flasher that works fine, but it has one small hole that the sound emanates from. You can partially tape over the hole to control volume. I wanted to up grade to a newer flasher for LED lights but the sound from these buzzers come from all sides and you can’t control the volume. But they do work well….

If you’re going to use this as an alarm substitute for a bmw e46, I would suggest spending a little more to get a louder buzzer or an actual siren. Sound is easily muffled by the hood, but sounds decent with the hood open.

I used two of these in parallel to chase moles from my yard. Wired to a timer that provides a 15 min on cycle every hour or two. I placed them in a plastic gutter drain tube and burred for a short run in the ground. It seems to be working great when all the poison peanuts and other commercial products failed. It's only been a couple of weeks now, but if they just work for the rest of the summer I will gladly order new ones next spring. (NOTE) I was able to place these in an area upstream of the water flow in a clean-out. They don't seem suited for wet locations.

High pitched beep that is very loud as other reviews have stated. I tried at 24 volts and it did not seem substantially louder and almost as if it was overdriving the unit. I settled to operate it at 12 volts and did not attempt sustained operation at 24 volts. Perhaps somewhere between 12 and 24 volts could give a louder output but it was plenty loud for my needs at 12 volts. The wires are very thin to work with but nicely solder tinned at the ends for easy soldering if that is your choice of connection.

worked for a little while.

They worked on f250 wired to key on fuse to tell when head lights were on

These 12v buzzers are quite loud. They do not detect motion, but were not made to do so. No idea why that was a question in the rating schema. They turn on and off with a switch, not motion! I use them to report my turn signal activation on a motorcycle and since they are loud, they are very good at it. I have had them for two years now and still going strong.

Excellent pour servir d'avertisseur de clignotant de moto. Pas aimé la différence de note. Un sonne plus haut que l,autre. J'aurais aimé avoir deux buzzers de même tonalité.