125dB Loud Motion Sensor Alarm with 328ft Remote Control(40ft PIR Detector, 3*AA Batteries), Indoor Wireless Infrared Security Motion Detector with Siren for Home/Shed/Garage (Black)

I'm using this as a catalytic converter alarm for my Honda Element when parked in my driveway at home. I attached it using zip ties to a magnetic camera mount. I put black electricians tape over the sensor on each side to narrow the motion sensing area. I reach under and attach it to the inside edge of the wheel well of the front passenger tire when I park at home. I aim it towards the catalytic converter. Then I put a small cardboard box with a brick in it so it doesn't blow away (gets windy here) under the Element right in front of the alarm device. The box is about 12" x 14" x 5", and I slide the box in on its side, so it's standing up tall enough to block the sensor. It goes right under the catalytic converter, and in front of the alarm. That stops animals from setting it off when they pass under my car at night. (I especially don't want it going off when a skunk passes under my car.) Without the box there, my feet passing on the driver side of the Element will set it off. If someone were to pull the box out, the alarm would go off immediately. It will wake me and the neighbors. It is very loud. When I tested it, neighbors two doors down came out of their house and a person who lives on the block behind me told me he could hear it from inside his house. I'm hoping that the thieves would take off rather than proceeding to crawl under my car with the alarm going. Even if they see the alarm device mounted on the wheel well, it will already be going off and alerting the neighborhood.My catalytic converter has been stolen twice and has been targeted two other times, when the pipe was cut but they didn't get it. It's even been cut through completely with a cat strap on it. I also have a blink camera on a magnetic mount under the car when I park at home, and the second time my catalytic converter was stolen, the thieves got it off in less than 1 minute with two thieves with saws cutting from each end of the cat converter. (They didn't notice the camera.) By the time I got the alert and got to my door, it was too late. I have another camera in front of my house, and from the time they rolled up to the time they took off with my catalytic converter was one minute and 6 seconds. Hoping that an alarm sounding immediately when they move the box out of the way will prevent another theft.I've been using this for about a month and a half. It has the same batteries in it. I arm and unarm it whenever I'm coming and going. It is a little bit of a hassle but it's better than having to replace the catalytic converter again.There are catalytic converter alarms that hook up to the car battery and get mounted under the car. The catalytic converter alarms are quite expensive and have about the same decibels as this. The catalytic converter alarms supposedly take several minutes of movement before triggering the alarm, to avoid it being triggered by animals. I've read it's easy for thieves to just cut the wiring on them.I'm planning on selling the Element. Once I do, I will keep this alarm to use as a back door alarm. It has different options for a loud alarm or a quieter tone. The remote that comes with it also works well.

This thing works and it will pierce you eardrums. Hell a burglar would leave even if he knew you or the cops wont gonna come. He would not think anything near this thing would be worth busted eardrums. Don't be fooled. It has more than one loudness setting and you do not want it close to you if its set on loud. 125dB? I do not know about all that but it may well be.

Very loud. Is perfect to scare strangers away.

This 125dB motion sensor alarm works perfectly! The sound is extremely loud — enough to deter any unwanted presence instantly. It activates and deactivates smoothly with the remote control, which is very convenient. The setup was quick and straightforward, and the sensor is responsive and accurate. Whether you're using it for home, garage, or small business security, this alarm gives you peace of mind. For the price and features, it’s a fantastic choice. Highly recommended!

The detecting range is very low. No way you can get 40 feet. I tried to setup detector range for 30 min, moving up and down. I installed in living room and I think if you will move slowly, it's not gonna detect you. It's barely detects from 20 feet. I can walk cloth to the wall and get to another room without alarm.

Seemed to work well enough. I placed it so that if our puppy tried to enter a certain area, it would notify us. There was no other traffic in that area, so other than my testing it on a couple of occasions to make sure it was still charged and everything was functioning as intended, it sat idle. It just started going off on it's own last night and now wont stop going off. Charging it more had no effect. I expect more than a 6 months out of a product, more like many years... I can't recommend.

Great cheap option to have your spaces controlled at home. It is very loud, which is good.

Easy to set up and is loud!