ultrasonic cat, dog and fox repeller

An ultrasonic repeller creates an uncomfortable environment that a cat, dog, fox or badger will want to get away from quickly. Many ultrasonic cat repellers have an PIR motion detector, that when an animal moves in front of it, activates the ultrasonic noise that a cat hates. It's not painful or cruel, just annoying to a cat. The most common reason for purchasing such a device is to stop cats fouling on your lawn or flower bed. If you aim the ultrasonic repeller in the general direction of where the cat is pooping, it should work fine.
 
fox standing still in a garden                       badger in garden undergrowth                       a cat hiding behind a wooden barrel in a garden on a summers day 
 
There are a few points to mention about positioning the ultrasonic device. They don't work through bushes, shrubs, hedges or anything else that is an obstacle. The unit needs a clear line-of-sight for both the PIR motion sensor to be able to detect movement and the ultrasonic tone to be heard by the cat.
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