Bests & Worsts Reviews from Amazon

If you are considering a ultrasonic repeller, especially in indoor applications, look no further. The reason is not only because this unit is quite unique, but also because of the customer service experience. First of all, this unit is unusual because it has three separate ultrasonic emitters. Based on the shape of the unit, my guess is that they do a good job of covering over 180* around the unit with 135+ db blasts of ultrasonic energy that vary in frequency but whose main targets are rodents like mice, squirrels, and rats. There are multiple operating modes, allowing you to test the unit (it squeals in a audible frequency range) or determine which transducers get to operate. But more importantly, when something goes wrong, Dan H., the seller, is there to personally help you troubleshoot. When he read I had issues, he contacted me immediately to figure out what may have gone wrong. He was very kind, helpful, and exclusively focused on making sure I liked the product, or my money back. Ultimately, that's what happened, he refunded me the whole package (including shipping), which is very unusual but which illustrates how he stands behind his product. Why do business with other merchants for ultrasonic repellers when you can do business with Dan? Anyhow, I initially gave this product only three stars because based on observations of the back yard, it seemed to work on some, but not all target animals. That is, I set up the unit, confirmed with the test mode that all was well, and went on my merry way, hearing the squirrels chatting angrily behind me. The unit itself is nearly silent in operation - some aspect of the ultrasonic noise can be heard, but it is very, very minor and presumably consists of harmonics. But then the local skunk and a squirrel happily started grubbing in my yard - and at least the squirrel should not have! Since I was leaving town for a couple of days, I disconnected the unit and wrote my review. Then I started conversing with Dan by e-mail and discovered what a caring merchant he is. Several days later, I got home and started troubleshooting. The first thing I noticed was the lack of the faint noise the unit should be making when plugged in. I checked the power, then suspected a bad power supply. Luckily I had a Velleman 3-12Vdc Adjustable Power Supply on hand to see if the issue was inside the unit or if the power supply had failed. Once I got the voltage, polarity, and plug size right, the emitter started right up, confirming that the small OEM power supply had failed. Dan assured me this was very unusual and issued a full refund (including shipping!) and didn't even want the unit back. I then retested the unit outdoors with the new power supply, and once again the squirrels were on the run. I even convinced a skunk to vacate the lawn (which makes sense, its hearing range is similar to that of squirrels). While chasing pests out of your yard or house is possible with this unit, I would also focus on minimizing habitat / food sources for pests on your property rather than relying on devices like this. After all, you too may suffer a power supply failure just when you weren't looking. So, if you have an attic filled with squirrels, it's likely not good enough to set up a ultra-sonic repeller. Long term, you should also close and seal access holes. Who knows, some day you may encounter a old and deaf squirrel who won't mind the noise coming out of the replier! In closing, I would recommend this ultrasonic repeller over any other unit sold on Amazon. Failures like the power supply happen to any product - but what differentiates one merchant from another is how they handle the situation. The reason I'd buy this over a competing product is that dan stands behind his product!