Silent (but powerful) cockroach repellent sound | ultrasonic deterrent | ultrasound

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Get rid of cockroaches using 30kHz ultrasonic waves that insects hate. If you play the sound continuously in the place where you see the roaches, they will disappear and never come back. Use an old cell phone to play it all the time. Using a good speakers makes you get a better result. However, the results may vary depending on the cell phone and the speaker model. Set the volume between 20~50%. The sound is safe and inaudible to babies/children. Dogs and cats can hear the sound, but it's safe and stress-free if you decrease the volume to 20%.