2V 3V 5V 6V 9V 12V DC Piezo Electronic Buzzer Very Load Alarm Electric Security Siren Horn 120dB@12VDC

I bought this as part of a DIY FloodLight system that I'm building. This will be the siren that I will be able to trigger, either by motion or remotely. I had no idea what to expect really. I received it and took it out of the box and was impressed with the build quality - I was expecting something much cheaper feeling. For the price it's actually well constructed. Next, being impatient, I just grabbed a used AA battery (maybe it had ~1.2V charge on it) and just connected both ends of the siren to it (after snipping off the 3.5mm jack connector - save it for later if I need it). Even at 1.2V it had decent volume and was good to alert someone indoors in the same vicinity. Probably not going to hear it out doors but I was impressed that even at 1.2V it was a respectable "noise" level. I then got out my power generator and connected it up and started cranking the voltage up - after around 2.2V it became VERY loud. I increased it to 3.3V (which would be the output level of my esp8266 mcu) and it was VERY LOUD, almost to the point where i needed some ear protection. My wife started nodding - yeah, that's definitely going to frighten away anyone nosing around our front porch. I stopped there because I was indoors. I'm shuddering to think (in a good way) how loud this will get at 5V, or even the full 12V. So very pleased with this unit, so pleased that right after this review I'm going to buy another 1-2 units. It's nice to know I could potentially power it from a single AA battery all the way up to a full 12V. Highly recommend!

I have a stand alone remote controlled motion alarm. I plugged this siren in and mounted it in the next room. Installation done. This little siren is loud. It is a different pitch than my other alarm and between the two it is uncomfortably loud. I definitely recommend this siren if you have a device that it can plug into.All the wifi smart security system cameras are great for helping the cops find the perps after your house has been robbed or you have been killed. A few now have sirens in addition to all their cameras. Did you know that you can buy wifi jammers on the inter net that nullify your wifi security system? Buy a couple of battery operated or battery backup stand alone non wifi old school motion alarms for the rooms where your outside doors are. Even high tech crooks don't like loud alarm noise.

I don't know how they can get such a loud sound out of such a small package but this thing delivers.Be very careful when testing this, it is loud enough to damage your hearing when close to it. Makes an excellent burglar alarm, should drive them away. Put one of these in every room of your house and they won't be able to tolerate being in there.I almost took off a star because of the plug and no documentation. But simplest is to just cut it off - however that would prevent you from returning it if you decided it wasn't loud enough ha ha. Anyway I found that tip is positive and the sleeve is negative. It survived having the voltage reversed.I only tested it at 12 volts. If it is too loud for your needs then you should be able to reduce the voltage for less volume.

This siren is rated for 12V, but it's already uncomfortably loud at just 3.3V. I'm hesitant to run it at the full 12V.

Wish it was louder.

I finally wired this up today using 12VDC. It was SO LOUD I had to immediately turn it off, and my ears were already in some sort of funky situation. I left the room and tried again. AMAZINGLY LOUD! I bought this because I'm building a doorbell box for my elderly mother, who can't hear very well. Unfortunately this is not the right siren for the job. Just too loud. Ear damaging loud. If you want to drive someone out of an area, this is the right siren though. I'm going to try it at 5VDC to see if it's tolerable. Otherwise I'll need to find something else.

This thing is loud. I clipped off the aux cord plug and wired 2 of them to a toggle switch, and then to a 12v 40 watt transformer with power plug. The alarm on my security system is a joke. This can be toggled at will and is right by my security monitor. I'm sure it could be heard from blocks away. Can easily hear it inside with doors closed. It is smaller than i expected but works great

This is a siren. The noise is makes is like an ambulance and isn't what I needed. I had to cut the plug off the cord and attach it to a battery to find this out so I can't return it.