Harmless And Safe: Using intelligent built-in chip to create painless sound and vibration stimuli to deter unwanted annoying barking. There is no painful, anxiety-causing shocks, so don’t worry about the harm to your dogs, its very safe. Universal And Adjustable: The size of the no bark collar is adjustable, you can change the size of it according your dog’s size,no need to worry about the unfit for your dog. Automatic And Intelligent: This equipment detects movement of your dog's vocal chords. It then emits audible warning beeps and then followed by vibrations if the barking continues three times. Your dog will quickly and easily associate these with his barking and gradually reduce or stop barking at certain occasions. Solid And Waterproof: This new & improved no bark collar is certified according to ipx6 waterproof standard. Now you can walk your pet in rain and in wet weather and be sure that the device will work. Money Back Guarantee: If for any reason you are not satisfied with your purchase, please contact us, we promise one year worry-free replacement and one month money back warranty. We always strive to deliver the best customer experience. Just contact us and we will solve it for you within 24 hours.