They open and close very smoothly and stay in place. The first app was on one of my 1st gen Amazon Echo Shows and I found that I hadn't positioned it optimally {...black on black, old eyes and low light}. At first I thought I'd ruined one and was glad I bought a pack of nine. But when I tried to slide it into place (NOT lift it), I found that initially the adhesive was flexible enough to adjust the placement by about an eighth of an inch. A good price for something that will likely prove to last a lifetime? They come in a small hard plastic case which is great for storing, protecting and storing for future use. In addition, according to the descriptions and reviews of these and other brands, it has one of the lowest profiles. That should make it less likely to snag on something and open accidentally.
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