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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KEMO Ultrasonic Signal Generator Module - 12-15V DC, <50mA, 8-40kHz, Black, Rotary Switch, Speaker Actuator, Automatic Operation

Product ID: 484699250

Details

Connector type
Screw
Contact type
Normally Open
Current rating
50 Milliamps
Operating voltage
15 Volts
Operation mode
automatic

⚡12-15V DC power

🔄10-position rotary switch

🔊8-40kHz ultrasonic range

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.

Specifications

ASIN	B00NRH95AY
Actuator Type	Rotary
Brand Name	KEMO
Circuit Type	4-way
Color	Black
Connectivity Protocol	X-10
Connector Type	Screw Terminals
Contact Material	Metal
Contact Type	Normally Open
Control Method	Touch
Controller Type	Ring
Current Rating	50 Milliamps
International Protection Rating	IP00
Item Weight	1 Pounds
Manufacturer	Kemo Electronic
Material Type	Plastic
Model	4330881478
Mounting Type	Surface Mount
Number of Items	1
Number of Positions	1
Operating Voltage	15 Volts
Operation Mode	automatic
Part Number	M048N
Specification Met	CE
Switch Type	Rotary
Terminal	Screw
Unit Count	1.0 Count
Upper Temperature Rating	60 Degrees Celsius
Wattage	4 watts

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