Having read the reviews and seen the video I thought this product would do the job. My garden is not the biggest, at 5m long by 4.5m wide, it is essential a rectangle with a small shed in the far corner.
Having installed the unit onto the wall of the house with perfect coverage of the garden, this was tested from practically every point in the garden, I looked forward to a cat dropping free period.
This was not to be, as within 1 week of installing the device there was a fresh pile within 3m of the device. I checked the positioning of the unit and, sure enough, it was being activated from that location so it obvioulsy had not worked on this occasion.
Giving the benefit of the doubt, I left the unit in place for approximately 6 or 7 weeks. the result was the unit may as well have been removed, as fresh droppings were seen throughout the time the unit was "repelling".
I would have to say that this product does NOT do what it is designed to do and would NOT recommend this to anyone wanting to repel any creature from their garden or other area.