Great when they aren't defective
I have bought 6 of these. Recently, one needed its batteries replaced and then kept "blitzing" on making a loud buzz and the purple electric bolt in the photo. I contacted the seller about it and haven't received any replacement or refund. Other than that one, I'm obviously pretty happy with them for the refrigerator and other small areas like my closet and by the litter box. It gives off an ozone scent.
Rating: 3 stars