It does absolutely nothing for the pigeons. Due to the noise, it is not suitable for apartment buildings. We tried it for one day. The neighbors were more annoyed than the pigeons.

I had the impression that it would work periodically. For example, the lights would emit and at the same time it would make a sound every 30 seconds for 5-10 seconds. As soon as you turn it on, it works continuously, resulting in it shutting off on the 3rd day of operation. It is exposed to the sun facing south, but obviously the solar panel does not charge the rechargeable battery. The sound it makes is in the audible spectrum and is somewhat annoying. Overall, very disappointing!!!!!

It does not emit ultrasound, it emits sounds that are audible to the human ear, therefore annoying! Also, it does not repel even a fly at a distance of half a meter! Unacceptable! Waste of money!!

The pigeons, magpies, crows, sparrows have gone. It has been working non-stop for a week, except when I turn it off. Satisfied!

It does what it promises. I give it 4 stars because I don't know its durability over time. Very good autonomy, it works flawlessly even with a little exposure to the sun.