To me ,The product is good. it works if any vibration or glass is broken by force .I rated one star , because I bought a 6 pack of glass breaking alarm almost a year ago , when the order arrived , I open it , after I sticked 5 on the glass window , the 6th one didn't have the window sticker ( shown above photo), I had to stick the alarm directly to the window . I wrote a comment and took a photo of what is missing .I bought another 6 pack of glass again on Feb 15,2022 . , I thought it was sold from a different seller , when the order came , but I was busy working and didn't open the box till two weeks later . Then the same thing happen again , one window- sticker is missing.I like to ask the seller , why is that ? .
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