Bird-X Balcony Gard, Ultrasonic Bird Preventer, Outdoor Bird Decoy with Motion-Sensor, Easy to Install, Covers up to 900 sq. ft., 15 to 25 kHz Frequency, 6.75" x 5.5" x 3.5"

Junk product. One star is one too many. Does not work. Does not deter any birds in a small open end building. Tried it all settings, but results were the same. Birds even sat on it and defacated on it. And laughed at me! Save your money. I'd return it, but since I wanted to give it a very fair trial, I waited too long to do so.

I don't write many product reviews but think I can be helpful here.This works GREAT if you can plug it into a power outlet and avoid using batteries. That's because the unit operates continuously when plugged in, but it uses a motion detector to turn on when battery-operated. So it will be less effective with batteries than if you plug it in.Also, put it at least 3' off the ground. I tried it on the ground at first and saw some birds land nearby. Problem solved when I elevated it.I got 2 of these for 2 different balconies several weeks ago. I used them as described above, and now there's literally zero bird poop out there, and I don't constantly hear or see the pigeons. Much better than the bird spikes, reflective materials, and mint oil that I previously tried.

DOES NOT WORK. I have a problem with birds nesting on a small porch with very limited access. I set up the Balcony Gard so it was pointing at their entry/exit point. I started out on the low frequency as suggested. After a few days of no success i moved it up to halfway between the low and high level. With no luck yet I switched it to the highest frequency. After days on each setting the birds continue to come onto the porch nesting and making messes. This product does not work.

I installed it on my front porch today just 6 in off the ground and that's the top of it I did this to keep the birds off of the concrete but I did notice one thing the big birds they react to it a lot but when it comes to the little sparrows they kind of accept the Whistling noise and act like nothing's going on and do their business but far as pitching size yeah it's effective but sparrows I don't know why they get used to it

It started working from the moment I plugged it in. No more bird droppings and avoiding my terrace. Have been recommend it to all my neighbours.

I use this as one method to keep the birds away as they were destroying my paint on my cars which had cost me about $1000 in repairs. With two owls, holographic tape, sticky bird caulk it did the job, This was the last thing I tried since all the others only got me 80% of the way. Some birds might sit on my owl head mocking me, other sit above the holographic tape. But those were only minor players. I wanted to stop birds from my neighbors house that nest in spaces in the house that should be sealed. The birds would fly in and out over my cars and the neighbor, to say the least is less than helpful. This device stopped maybe 99% of the fly overs. It is unpleasant for them to hang out near my cars now. Much less birds. To the bird, the shinny cars look like lakes and a good spot to splat bird droppings.Inside (in the back under the plastic push on cover) is a frequency control and range control, and a jack for the 9V adapter and place for 4 C batteries and power switch (battery or power jack). When it is triggered, a red led lights in the sensor and it makes as short audible twerp (plus the actual sound that continues) . I like it but there are some down sides. First off the frequency control adjust differently if you use the adapter (starts I think at the 15000 hz) than the batteries (6V) which I believe is somewhere around 14000 hz. Though it may actually be between 17.5-18.5.This is because there is no voltage regulation internally. As the batteries wear out the frequency drops from where you set it, until it finally goes insane making crazy noises. I also notice it was temperature sensitive as to the frequency (in the cold it drops) and goes crazy. Let me tell you why this important besides being annoying. There is a device named the Mosquito which is used at train stations and parking lots that is teenagers hear that is annoying and they do not hang around. This is a costly item. This device with the batteries, send out the 14000 hz signal (or 17.5-18.5) and above or lower with the batteries . So it can be used for the same purpose on the cheap and I can tell you it works. It can be adjusted that teenagers, some women, and other ages hear it. I had to have my neighbor's kid stand there so I could adjust it so he could not hear it as he could hear it 25 ft away through an open window. Those frequencies do not go through walls - only openings. As the batteries died, it would swing the frequency down back into the torture range! A food delivery person once came and he was holding his ears in pain (he was 3 ft away) and was saying what is that, what is that , it hurts, while I heard nothing. He was running away as I gave him his tip. So point is human beings can hear a tortuous sound if it is set to too low a frequency. But maybe that might be want you want. The device sold to chase teenagers costs between $300-500 so this is so much cheaper if that is your purpose. As far as bird again, I find it really does work.I have this strapped to a fence aimed over my driveway it so far with all the things I have done, no bird droppings. This device is best used with the power adapter which has quite a long cable. In my case, I am going to devise a way to run it on solar as not to deal with the batteries. The battery life is based of course on how many times it is triggered. Since people and animals trigger it, it can be going off quite a lot. Constant on, can only be done when it is on the AC adapter.OK, all said, I can say this thing does work for me. I actually bought two of them and I have not even needed to use the second one so far.

Does not work. The birds actually sat on it. I should have read the reviews before I bought. Do not buy!!!!

My original review is below but, sadly, is no longer valid. These devices worked fine for 2 weeks but it seems the birds got used to the noise and are now back as bad as ever. While I once recommended these highly, I withdraw that view. I think our next effort will be one of those blow up clowns that flop around and attract attention to car washes.***************************************************We bought this device to scare away the hordes of quail that were descending on us daily and making a big mess. We tried other devices that supposedly would keep these birds away. None of them worked. So, with a lot of skepticism, we decided to try once more never really believing that anything would help.Within 2 days, the quail stopped coming and haven't returned. We bought a second unit and aimed it in another direction and the birds stopped coming there, too. Even a squirrel that was eating plants in our flower pots disappeared. We haven't had any of these pests in a week now!The units makes no noise that humans can hear. I don't know about household pets because we don't have any. As for getting rid of birds, I remain astonished and delighted. I am writing this review because this manufacturer deserves a compliment. I'm giving this product 10 thumbs up! I'm a real buyer and no one gave me or promised me anything to write this review.