12V DC Black Mini Piezo Alarm Siren 110dB Insurance Safes Anti-Theft Alarm High-Decibel Buzzer for Car（Pack of 5）

Built burglar alarm and this will get your attention and the neighbors attention. Very loud easy to use perfect size and great value for the money.

If anyone is looking to add these to a car alarm and place them inside the car, these are for sure going to disorient a potential their. Sure, if they want it bad enough, they will take what they want, but these little things are going to disorient them. Far louder than I expected. If you are in a compact space, these will suffice. Totally worth it!

Loud little piezo for it's size!!..but @12 volts from my bench power supply, they are only around 81-84 decibels on my meter.

I bought this siren for a basic alarm system to make some noise when the garage door is kept open too long. That was a common enough issue to justify this little project. Ever since the siren was installed, the problem is solved. the sound is *VERY* piercing and even on the second floor the alarm cannot be ignored.It is great for security systems that need a really loud alarm.

Piezoelectric siren effect made louder in the tuned enclosure. Using all 5 in an array to disable burglar.

These things scream when hooked up to a 9v battery! My sound meter had them averaging around 110db and can hurt your ears if you're to close. This is perfect if you're looking for an extra loud siren type of alarm (which I was). They are also very easy to open up and remove the speaker components, to then be repurposed and used in other projects such as with an Arduino, etc.

I made a couple of trip alarms for my front and back doors. I have mistakenly opened the door and found out firsthand that you will not sleep through the noise these things make. They are penetratingly loud. Great for these entrance alarms.

Work for my purpose.I don't think reach the decibels they mentioned... but good enough