Not ultrasonic as advertised
The ad and the package both state it is an "ultrasonic" sound device. It is not! It is a sonic sound device.<br />What is the difference between sonic and ultrasonic?<br />Ultrasonic "sound" waves are not audible to human hearing, whereas, you can actually hear the sounds produced by sonic sound units.<br />You can hear the buzzing sound produced by these units, hence they ARE NOT ultrasonic. That being said, might they still actually work to keep the moles at bay? Maybe; only time will tell since I don't expect feedback from the moles.<br />However, because I also treat the invaded area with the caster oil/detergent/mint solution, I may never know if these truly ran them off or if it was the caster oil treatment or a combination of the two. But the devices are more-or-less a set-it-and-forget-it device, I figured I can't go wrong with just leaving it in place until it either stops functioning or I smash it with the lawnmower wheel, whichever comes first.<br /><br />UPDATE: Not only is it not ultrasonic as previously mentioned, (for whatever good that would do, even if), it is woefully ineffective. Look at the photo taken on 12/15. The mole/vole/giant earthworm/prairie dog, whatever it is, dug a new tunnel within about 18 inches of this device that was emitting its "uh, ultrasonic" audible sound every 20 seconds. Now, they never showed up again in the area where I soaked the soil with the caster oil/Dawn/mint mixture. I had not sprayed this area because, well, I guess I'm a sucker for a gimmick and I was cautiously optimistic that this just might show some promise. Well, now I'm playing hardball with a more "permanent" means of eradication.
Rating: 3 stars