This ultrasonic dog repeller circuit will chase away angry dogs. It is build with the all known 555 circuit, a buzzer and a little ferrite transformator. The ultrasonic frequency must be set with a ...

When we hear the word “Ultrasonic” we often refer it to bats and dolphins communication. Technically, “Ultrasonic” applies to sound that is anything above the frequencies of audible sound, and ...

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And will not hurt your own cats, dogs or other pets. 【Solar Fast Charging & Waterproof】 The top of our solar ultrasonic animal repeller has a high quality solar panel which has high absorption ...

Q: Several dogs with unknown owners have been pooping and peeing on my front lawn. Is there some ultrasonic gadget that would keep them away? — Josh Swaney, Conyers A: Sound repellers have been tested ...