It’s a fact. Some pests can’t stand ultrasonic frequency. This kit generates an ultrasonic signal that oscillates bet- ween 18kHz and 82kHz every couple of seconds. Has a range of about 10 feet. 9V battery not included.

Principles taught: Ultrasonics, volt. controlled oscillator, transistors.

Components: 2 capacitors, 4 resistors, LED, 2 transistors, IC, speaker, slide switch, battery snap.