Cats coming into a garden can become a real nuisance and its worrying to see favourite song birds being stalked not to mention fouling on the lawn and territory marking so how do you get rid of next doors precious pet without causing offense help is at hand with the selections solar powered battery operated ultrasonic cat repeller this effective repeller features a pir passive infrared sensor that detects the animals movements and activates an ultrasonic blast that scares the cats dog