Review on EverNary Window Alarm 125DB Loud Ultra-Slim Anti-Theft Alarm For Door And Window Glass Break Vibration Sensor Alert With Adjustable Sensitivity (5 PCS) by Marc Alvarez

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 ? .