They really help deter birds from hitting windows. I've had it for about 3 weeks and I haven't had a bird strike on my rear window. I have a large window overlooking my back yard where I feed birds and other wildlife and I have had an issue with birds knocking through my back window. I've always put some kind of sticker on this window and nothing has worked so far. I'm sure it has something to do with their prismatic effect. (and the reflections in my house are beautiful) They work!
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