Someone mentioned the frequency fluctuates. Can you lock in a frequency or does it always fluctuate?

My unit does "waver" at about 2 Hz around the set center frequency. When in the audible region it sounds like a sound effect in an old TV show. The "wavering" is definitely an intentional design feature, not a problem with the circuitry. I watched the output on an oscilloscope and the wavering continues even as the frequency moves to the highest end of the frequency range. For any use other than a pure signal generator, like trying to drive away critters, the wavering is probably a good design feature.

If I use this device + piezo loudspeaker + bullhorn will I be able to get the desired effect on a dog about 150-200 ft away?

It works good on some dogs at that range, but others can be within 50 and ignore it. We had 3 dogs next to us and 2 of them never noticed and the 3rd one would stop barking and run for the house. He would head to the house when he was at least 200 feet away, he soon became a non barking dog.

Can this run on batteries? Or only DC power plug?

Batteries such as AA or AAA or similar chemical batteries are DC. The device does not come with a battery compartment. I guess if you attached a battery the device would work.

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Description

🔊 Ultrasonic power at your fingertips — keep pests out, peace in!

COMPACT DURABLE DESIGN - Fully potted plastic enclosure protects internal circuitry, perfect for indoor or outdoor use without worry.
VERSATILE PEST REPELLENT - Effectively deters rodents, insects, birds, and even wild animals—ideal for homes, gardens, vehicles, and storage spaces.
ENERGY EFFICIENT OPERATION - Consumes less than 50mA, ensuring low power draw while running continuously on standard 12-15V DC supplies.
MULTI SPEAKER COMPATIBILITY - Supports up to 4 piezo speakers simultaneously to amplify coverage across larger areas.
PRECISION ULTRASONIC CONTROL - Easily select frequencies from 8kHz to 40kHz with a top-mounted rotary switch for targeted pest deterrence.

The KEMO Ultrasonic Signal Generator Module is a compact, energy-efficient device operating on 12-15V DC that emits adjustable ultrasonic frequencies between 8kHz and 40kHz. Designed for multi-speaker setups, it effectively repels a wide range of pests including rodents, insects, and birds. Its durable, fully potted enclosure and intuitive rotary switch make it a reliable and versatile solution for professional-grade pest control in various environments.

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