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I LOVE this product. i have purchased two sets. Very loud and sturdy. They work instantly, there's no way to tamper with them from the outside. And they have an alert to let you know the battery is dying when you switch it on, it'll flash red indicating it needs changed. My only problems are that they are impossible to take off. we put them up in a rental and had to leave them because they were SO sticky that we couldn't get them off the windows and doors without leaving half the adhesive pad or a sticky mess. And the batteries are hard to change. The clasps don't hold them in very well, so as you're trying to replace them and get them put back up the battery just falls out of it repeatedly. Other than that, the product is wonderful.
I didn't install them on my windows yet, but I have one by my bedside. The sound is so loud and shrill, this would be a great defense in any situation. Just flip the "on" button and the sound is almost unbearable. Great!!
I received these and got my son in law to install. We were all amazed at how easy they were. We have them on doors and windows. They make a super loud noise. We love it!!! I would highly recommend them to anyone. Thank you!
Very easy to install and use. Note: the adhesive is VERY sticky, so make sure you install it exactly where you want it. If you need to adjust the placement, it'll be pretty hard to remove. I actually broke one of the alarms because I had to use a screwdriver to pry it off my door frame.