They are certainly audible, and a bit annoying especially if you plan on being with them in the yard all day. It also works wonders in repelling raccoons, deer, and similar critters. I am so pleased with this product that I ordered three more to be set in other parts of my property to keep cats and deer away. Ugh! Next step -- drones. Aspectek UPGRADED Yard Sentinel - Electronic Ultrasonic Animal Control, Pest Control Pest Repeller with Motion Sensor, Sound Frequency: 15kHz-18kHz (Green) 3.0 out of 5 stars 136 CDN$40.99 This is the third time I've written on this product. Solar powered, no cords necessary. They had been destroying the bird feeders I regularly hung in my yard. This best outdoor ultrasonic pest repeller transmits its signal in all directions approx. It worked immediately. Hanging mothballs around the barbecue did not keep them away so I ordered one Yard Gard Ultrasonic Pest Repeller. 50 ft so they can be placed approx. Pigeons are real jerks. Easily mounts almost anywhere, mounting stake included. This maintenance-free device keeps animals away from your property without the use of messy, dangerous chemicals. So costly and -- for the squirrels I'm dealing with -- worthless. Reviewed in the United States on April 16, 2016. Purchased 2 units in spring of 2014 not used till spring of 2016. Low Frequency Pest Repeller and Pest Control Yard Gard Deer Raccoons Squirrels The best-selling Yard Gard humanely and effectively deters pests, including squirrels, raccoons, rabbits, deer, stray cats, skunks, and other small animals with ultrasonic frequencies. To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Bottom line; if the pest is very hungry or likes your plants for shelter, this and all battery powered units will not repel the pest enough to keep them from eating your plants or staying 24/7 in a shelter bush. Total garbage. Who knows, maybe its soundless sound repelled several dozen ordinary squirrels but the big gray who plagues me dances to it. I was diligent about keeping the batteries fresh and had to change them once every two weeks or so (over the course of one summer, this ended up being quite a chunk of change in batteries). Top subscription boxes – right to your door, Bird-X YardGard Ultrasonic Pest Repeller - Model Number YG, See all details for Bird-X YardGard Ultrasonic Pest Repeller - Model Number YG, © 1996-2020, Amazon.com, Inc. or its affiliates. It also analyzes reviews to verify trustworthiness. Only draws between 3 and 4 watts of line power. Electronic animal and pest repeller uses powerful sounds to effectively repel deer, rabbits, raccoon, skunk, squirrels, stray cats, neighbor's dogs, opossum I purchased three of these units in June, 2014 to try to rid our yard of squirrels (better known around here as tree rats). My dog and most birds stayed away from them, so they may work for some animals better than others.