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The two components stick onto the window with a sticky pad attached to each comonent.
With this alarm there's virtually no way someone will get in that window without the siren going off, and that should be enough to scare them away.
I purchased this product as a replacement and was disappointed that the alarm fell off the window the very first day.
Enough said ... Don't waste your money. Very cheap product -- I wouldn't recommend it to anyone. The parts are cheap and they break way too easily ... Read morePublished 22 months ago by C17Flyer
Batteries were corroded and alarms did not work.Batteries were corroded and alarms did not work.Batteries were corroded and alarms did not work.Published on November 10, 2011 by grandparent
Stick it on or use small screws to attach it, turn on the on/off switch, and feel safe for around $15. You can't beat these. We put them on all of our doors. Read morePublished on August 21, 2011 by jd
You can't hear the sound unless you're in the same room. I installed it on my front door and couldn't hear it over the AC from my bedroom.Published on December 2, 2010 by Sadhana Ganapathiraju
Even after a year, the battery is going strong. This item works perfectly. When activated, it creates a loud sound after even the slightest movement. Read morePublished on November 12, 2010 by D. Nguyen
Easy to set up, and loud enough to wake the dead!
Two pieces (as pictured). You stick one to your door frame, and the other - to the door itself. Read more
These things are ok. If you live in a small apartment/house, and are sleeping (no background noise), you may hear the alarm? But, there is NO way in HEEL that it's 90 db! Read morePublished on October 9, 2010 by L. Erley
I promptly returned these because I thought they would be louder. I want it to be twice as loud!!! If a thief wants to break in - as one already did into my apartment and also did... Read morePublished on October 3, 2010 by Muse
I was disappointed in the battery situation. The instructions say to remove a tab attached to the batteries, but there is no tab. I measured the battery voltage on the bad ones. Read morePublished on August 29, 2010 by Kevin C. Higgins