They don't work on gophers.
927202
The only way these devices will rid you of gophers is if you happen to stab one while inserting it in the ground. I bought four of them for my 1000 square foot vegetable garden. That should have been more than enough for that area. They had no effect on gophers whatsoever.
2443192
does not work to keep raccoons away but it may be effective on deer.
671455
Our cardinal couples (3) would not feed when on ring!  The Squirrel Buster may have kept the squirrels away.  We don't know.
2566335
My soil is a standard top soil with clay and I'm sorry to say these did not work for me. I followed the directions and placed 2 of them, one in the middle of my back yard which is a 60 x 75 foot area and the other in the middle of my vegetable garden which is 24x24. The gophers destroyed my onion crop, chives and damaged some of the carrots and potatoes, they are still in my yard 6 months later. I even spread the caster oil pellets per direction hoping to get rid of the critters, but they persist. Poison is not a good alternative for 2 reasons, the pets and the residue can be harmful to humans if used in a vegetable garden. I would return this product if I could, but wanted to give them a fair test.
3923444
I bought four of these and they are do not work. I tossed two of them out becaus the trap would not set. The other two have been out for a week and have not caught the mouse.
2969763
Bought this to keep the birds and bunnies off my newly seeded lawn. It will not activate for either type of animal - they are all over my lawn. It does, however turn on whenever it feels like - always when there are absolutely no birds or bunnies on the lawn. This is an expensive device that really doesn't work. Don't waste your money!
2665504
looked for these at gander mountain, only to be laughed at by teen employees. these things WORK. the deer hear you and run in the opposite direction... from personal experience it also works for raccoons, barn cats, rabbits and mink. now only if those dumb possums would get the hint.
143040
These things are a waste of money...period! Save your money. Didn't work on squirrels  at all, if anything they attracted more.
608406
Bought home  depot gopher poison, didn't work. Bought this trap to try it out worked great. Its like a mouse trap but w/o the cheese. I have killed 3 gophers that were destroying my lawn. No gophers since. Advice: put some grass around the trap so it looks like it is underground so gophers will go inside all the way.
1193245
THEY ARE USELESS; DEER HIM MY CAR RIGHT WHERE IT WAS PLACED;
THEN I READ AND EDUCATED MYSELF EVEN MORE ON THIS USELESS PRODUCT;
PLEASE READ the National Scientific and Police research;
"Deer Whistles, they don't work! By Roy Truelsen"
From: Roy Truelsen
Date: 11/26/2000 1:35 AM
1324388
Didn't work.....at all, there are four bunnies in the picture next to the owl
1544487
The Victor Gopher trap works!  If you have a gopher problem in your yard, this trap will solve the problem.
4139175
Don't Seem to Work "At All" on Squirrels, like "Many" have put in Reviews on the Internet.  At least, they don't work on the Squirrels in Northern Nevada.  A Whole bucket and Not one Dead Squirrel, even though I've seen them Eating it Several Times.
3491462
These do not work.  Too much time has passed to get a refund.  Buyer beware of these products.  The furry creatures, snakes, and birds don't care about this product.  The deer still go to the fruit trees and munch away.  Battery life is about 3 to 4 weeks. Recommend you do not buy this product.
2590973
The Bell & Howell 50104 Motion Activated Ultrasonic Solar Powered Animal Repeller does not work.  After purchasing and strategically placing six of the units to keep the deer out of our yard, we found that they are totally useless.  After charging the units and checking to see they were working in accordance with the instructions the next morning the usualy heard of 8-10 deer were standing around the units enjoying our flowers.

Also, the unit failed to keep raccoons out of our bird feeders.

The bottom line, don't waste your money on this useless product.
4869551
How do you know they work? I'd like to see a video of deer reacting to this. Maybe it exists already? I'ma go look now on YouTube. Uh... 3 stars!
3723674
This product simply does not work on deer. They do not care about red flashing lights. Waste of money. I have two of these installed as depicted in manual, but deer in VA do not care about this. They come and continue to destroy trees.