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Title: 1/2 Acre Unit works better
Review: I bought two of the 1/2 acre size and they worked just fine. They zap a bug and that's it. So, I decided to save some money and bought two of the 1/4 acre size (for indoor use in a small space). They zap bugs all right, but then keep buzzing since the bugs are not zapped out of the killing screen. The continuous buzzing is quite annoying, so I am now going to replace them with the 1/2 acre size.
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