If the fly is on a hard surface, almost certainly hit it when it's dead, unless it flies away faster than you can hit it. However, if it's not that hard a surface (towel, something made out of cloth) you might not be able to kill it. I saw a lot of sure hits, but somehow they still flew away. The product is not well made. The first one I used is now broken. Maybe it won't take a beating on concrete, metal surfaces, etc. I'm glad it arrived multiple times - good for backups.
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