If you ever checked the ultrasonic pest repellents, you know these devices supposedly work. Ideally, they produce a sound human cannot hear, but pests and insects can. These frequencies from the device can be tweaked to the right level to irritate and drive out dogs, cats, raccoons, birds, foxes...
It’s possible that some ultrasonic repellents have some minor short-term impacts on animal pests, but most still don’t effectively control them. According to a study done by National Wildlife Research Center and the United States Department of Agriculture in 1995, the effects of ultrasonic repellents tend to wear off a few days after exposure as the pests get accustomed to the noise.
So the devices need with frequency, and change the frenquncy in some days. Also add the LED lashing function, make it more effective, then better to protect the place you want to keep pests away.
below items suggest for you.
