This new humane ultrasonic training device really works. A built-in microphone senses barking and triggers a choice of audible tone, or an ultrasonic tone that is inaudible to humans but not to dogs.  Once the barking ceases, the tone stops automatically.The tone selector allows you to adjust the sensor to increase effectiveness and minimise false triggers. 

The repeller covers an oval area approx 15 meters wide by 24 meters long.

There are three different settings between a 15,000-25,000 hertz range.

Plugs into the mains and comes complete with 30ft. mains cable, weather resistant cover and wall bracket. 

For outdoor use only.