Dog Bark Repellents Ultrasonic Animal Repeller Proboscis Outdoor Anti Noise Anti Barking Supressor Puppy Training InstrumentFeature:1. The ultrasonic barking control device can automatically detect your dog's barking from a distance of 16 feet. The barking control device will automatically make a high-pitched sound that only dogs can hear. When the dog stops barking, the ultrasonic barking control will automatically stop emitting ultrasound.2. Ultrasound is harmless to pets and is completely inaudible to human ears, so the device can be used safely3. It can be hung on a tree, interior wall, exterior wall or fence to prevent your dog from barking (within reach). When excessive cortex is detected, the microphone responds to the cortex and activates the component.4. Suitable for dogs from 6 months to 8 years. Specification:Material: ABSolor: BlackBattery Capacity: 1500mahSize: 11*8.5*4.85cm/4.33*3.35*1.91inWeight: 190gNote:1. Due to the different monitor and light effect, the actual color of the item may be slightly different from the color showed on the pictures. Thank you!2. Please allow 1-3mm measurement deviation due to manual measurement.1 X Bark Stopper