What diameter and lenght of pvc tube to use as a cannon?

I used 1 1/4” by 6.1” long PVC pipe. That length is 10 wave lengths for 22 kHz. Works good for the dogs across the street. I also used a remote control switch to active it. Press the button for 10 or so seconds rather than leave on continually.

Hello, can this be used in a car to a avoid running over dogs and cats on the streets?

I would say NO based on my experience with it having NO effect at all on any of our neighbors dogs, wild deer, ground hogs, raccoons, squirrels, coyote etc. Very disappointed… I have heard good things about the Deer Whistles or Wildlife Warning Devices sold at any box store which are only like $5.00

Is the remote control switch mentioned by others available on Amazon? Does this come with directions (I am a novice).

Search amazon for remote outlet switch. They are pretty common and many use them to turn lamps or other devices on/off by remote. Just plug the 12 volt AC adapter into that. (The LE Power Adapter lets you hot wire with an adapter it comes with.)

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KEMO Ultrasonic Power Cannon Building Block

Product ID: 75976304

Details

Battery Cell Composition
Lead Acid
Brand
KEMO
Recommended Uses For Product
Speaker
Unit Count
1.0 Count
Voltage
12 Volts

⚡12-14.4V power range

💡LED pulse indicator

🔊22 kHz ultrasonic frequency

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NT$2386

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Description

🚀 Elevate your build with ultrasonic precision and power!

VISUAL PULSE FEEDBACK - Integrated LED flashes to confirm active speaker connection—stay in control at a glance.
COMPACT LIGHTWEIGHT DESIGN - Just 3.94 x 2.36 x 2.36 inches and 0.02 lbs—fits seamlessly into any build.
PRECISION ULTRASONIC FREQUENCY - Operates at a crisp 22 kHz—inaudible yet powerful for cutting-edge performance.
RECHARGEABLE LEAD ACID BATTERY - Sustainable power with easy rechargeability for continuous, reliable operation.
ENERGY EFFICIENT POWER CONSUMPTION - Max 150 mA ensures long-lasting use without draining your setup.

The Ultrasonic Power Cannon Building Block delivers a high-frequency 22 kHz output powered by a 12-14.4V rechargeable lead acid battery, consuming just 150 mA max. Its compact, lightweight design and LED pulse indicator make it an efficient, user-friendly component for advanced speaker applications.

Specifications

ASIN	B002AFL1JW
Amperage	150 Amps
Antenna Location	Speaker
Battery Cell Type	Lead Acid
Best Sellers Rank	#81,179 in Musical Instruments ( See Top 100 in Musical Instruments ) #67 in Hand Percussion Blocks
Brand	KEMO
Customer Reviews	2.7 2.7 out of 5 stars (50)
EU Spare Part Availability Duration	1 Years
Global Trade Identification Number	04024028031613
Item Dimensions	3.94 x 2.36 x 2.36 inches
Item Weight	0.02 Pounds
Manufacturer	Kemo Electronic
Model Name	M161
Model Number	M161
Reusability	Rechargeable
Unit Count	1.0 Count
Voltage	12 Volts
Warranty Description	no Guarantee

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TrustScore 4.5 | 7,300+ reviews

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The delivery time was excellent, and the packaging was secure.

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NT$2386

Duties & taxes included

In stock

Sold byAmazon TaiwanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Taiwan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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