Aspectek - Upgraded Powerful Yard Sentinel Outdoor Ultrasonic Animal Control Pest Repeller - Deer, Cats, Dogs, Mice Repellent Eliminator Pest Control- 2 Pack Including AC Adapter, Extension Cord

This is a quality product! I purchased two explicitly for keeping the neighbor's awful dog from coming onto my property and harass me. Yes, the back covers are difficult to get back on, but they get easier with time after break in and learning the technique. The unit has many options and settings to make them versatile for various situations. Read the instructions carefully before you use this, for best results. Currently, I have both units side by side and one is set for the frequency for dogs while the other is on a rotating frequency to keep the dog from getting used to the sound Basically, it's keeping the dog from feeling comfortable in the area where it should not be. It's not foolproof, but it is absolutely helping 90 percent of the time and that is a win. The units seem well built, sturdy and weather resistant.

Partially effective on some animals. Adaptor provided is of poor quality.

Tried to get rid of pigeons but to no avail. They never moved. I tried all different settings and still no luck. To me, this was a total waste of money!

I’ve been trying everything for years now to keep the birds out of my blueberries and the deer from destroying everything in my yard. There is not a spray, scent or decoy that I haven’t used. So I bit the bullet and bought 2 two packs to use in my yard. What I found was that they are easy to setup and seem to be pretty sensitive even at a lowest setting. What that means for you is that unless you’re using the plugin adapter, you’ll need stock in C-cell batteries. Last about three weeks max as the are constantly going off every time anything moves in the yard (leaves, you or anything else). I tried the settings with and without the added screech of a bird which I think would be better if it was a human voice or dog barking, but it was pretty annoying since it was constantly going off in 4 different areas of my yard all day and all night. So how did it work? Well if you consider that deer stood 10’ away from it while it was screeching, creating high pitched noises and a red light and the deer continued to eat my trees and plants. Didn’t bother them in the least. Birds, flew and ate berries on the bushes right in front of it as it was working. Needless to say, for me, they didn’t even bother the pest that I have. Very disappointed that I purchased these and wish that I’d saved my money, but getting really tired of the constant fight and destruction of my property. I live in the country, but near neighbors who feed and cherish the deer, so maybe the only thing left for me personally is the physical removal of the deer as they are nearly tame around here (until hunting season starts then they’re nocturnal), so if you are in the same situation as me, save your money as they are like everything else that just doesn’t work.

pros: like the sensitivity and audible volume control ability and the nonsolar power so I can use in shaded areas. I ran extension cords to outdoor plug so plan to keep on thru the winter to deter deer from destroying my garden. Not using or relying on batteries. The audible screech carries 75 feet to back of house and windows, needed to be turned down and the control allows this :) Cons: the back panel is difficult to remove and replace and tends to warp the flange it covers due to very tight fit. Since the cover needs removed if any battery's changed or knob adjustments (above) . To attach to tree I used a bungee cord , wraps around front , no insertion site or flange on the box to hook into. I'd still order this , meets most of my needs and performing well thus far, deer are avoiding my yard since installed 2 devices.