Ultrasonic Dog Barking Trainer DeviceThis emits a completely harmless high frequency sound when your furry friend barks, which then turns off when your dog stops barking. In this way, your dog is automatically trained daily to stop barking at everything that happens around it. FEATURES Automatic bark detection Barking Control will automatically detect the tone of your dog's bark & will be active while your dog barks once barking halts the device will switch off. Anti Barking Easy