At The Fox Shop we have tested a number of Ultrasonic devices and the FoxWatch unit is the only one that we are prepared to put our name to. Don't be fooled by cheaper models or those that claim to deter a range of different species. FoxWatch is the most successful ultrasonic fox deterrent ever invented, and the reason is simple; Uniquely, each time the fox approaches its body heat and movement are detected and activate an ultrasound alarm (calibrated to be extremely loud to foxes ears but inaudible to humans and other animal species). As the fox retreats the alarm stops and in this way the fox learns to associate its movement with the noise and give a wide berth to the protected area of over 1,350sq ft.
 
Other ultrasonic fox deterrents do not do this. They simply emit a random or permanent ultrasound signal regardless of whether a fox is present or not. As a result any passing fox soon realises the constant sound of the alarm is not caused by them and therefore becomes immune to its effects.