Due to the height and location of our windows we needed a bird screen to fit inside. Most of them go outside and the ones that could be put inside looked like they should be in an 8 year old girl's room. I came across them by accident, but I was a little afraid to buy them because judging by the reviews they seemed difficult. But I tried them. I don't know if they prevent every bird strike, but I do know that they are very easy to use. Some were a little difficult to peel off, but if one corner didn't peel, the other did. I dampened the (fairly clean) windows with a damp paper towel and the deflectors stuck very easily. They didn't fall either. They also don't ruin the optics too much. If you need an indoor bird strike screen this is a really good choice and looks like it was made for adults.
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