We have tried other window sensor brands, but this one is superior. It has a clearly marked off and on switch. Very loud, which is good. And it came with 6 extra pieces of two-sided tape, in case we have to relocate them. All of them had adhesive on them. I had read a few reviews that said one in the order did not have the adhesive, but our order was fine and as I said, 6 extra pieces were included. And you can adjust the sensitivity of the vibration that will set off the alarm. Excellent product, I would recommend it! We ordered another set for the rest of our windows.
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