2-Mode Anti-Bark Collar - In 96% of cases, it helps reduce (eliminate) dog barking thanks to automatic performance with 5 safe levels of sounds (beeps) and vibrations. The beeps and vibrations change automatically depending on the intensity of the dog's barking and increase after each bark. Rechargeable Version - The anti-bark collar works for approximately 14 days with 1 battery. A full charge takes 2 to 3 hours. Action without remote control - The collar works in automatic mode, in which sounds and vibrations are combined to effectively and safely stop barking. At the first bark, there is only an audible signal, at subsequent barks, vibrations are added to an audible signal. Useful when you are not at home and your dog is left alone. Adjustable for small, medium and large dogs - the no-shock anti-bark collar is adjustable for dogs weighing from 8 to 110 pounds and having a neck length of 9 to 22 inches. Adjust the strap according to the size of your dog. Extra parts - In addition to