Chamberlain Wireless Perimeter Alarm

22% of reviews on Amazon.com give this product a positive rating.

The motion sensor gets into a mode of false detection and goes off all the time. No amount of adjustment of placement would help. The sensor was just faulty.

When it gets dark the sensor starts giving continuous false alarms. You can temporarily fix it buy taking the batteries out but the next night the problem will return again once you put the sensor batteries back in. In the day the unit has a high miss...

I have a 250' driveway with a clear path to the house. After installation the base unit wouldn't beep. I took the base unit, with the 9volt backup battery installed, out to the driveway and did some distance testing. The best consistent range I could...

this is not a good alarm sensor. it only works when you wave your hand right in front it. i gave it a 2 because it does beep, but you have to be right in front of it.

I have an 800' driveway with a small rise in the middle. The receiver could not pick up the signal from the transmitter until it had a clear line of site with the house. The system does not put out a very loud or long buzz when an object is detected....

Great product! Nothing fancy but it's sturdy and it works! I purchased this item a while back and worked great during very cold temperatures in Vermont. There is a slight 1 or 2 second delay once a person walks in front of it but hey this is Not...

Even pointed straight down the drive at approaching cars, it still does not trigger consistently. I have moved it 2x to correct this; no help.

i am very pleased with the effectivness of this product. works great, lets me know if someone is coming into the yard, and my dogs are safe.

I bought one of these about 8 years ago and it lasted for years but weather finially took it's toll. The sensor was about 40 feet from the reciever and I rarely had problem. I was very pleased and it worked well enough for me to buy another. It was...