Bark Collar -2018 Smart Chip-Dog Shock Anti-Barking Collar with Beep, Vibration and Harmless Shock. No Bark Control for Small/Medium/Large Dogs, 7 Adjustable Levels Safe for DogsOur dog bark collar will automatically stop working if your dog continuously barks for over 30s, preventing any negative effect to the dog. Carefree for dog owners. Adjustable SensitivityWith 7 sensitivity levels, you can adjust it to the level that works on your dog most. The combination of warning beep and static shock trains your dog effectively and harmlessly. USB RechargeableThis no bark collar has a built-in battery, rechargeable through a USB cable and can be used for 10 to 14 days after being fully charged. No more worries about battery replacement. Smart-Detection ChipThis anti bark collar adopts the latest sound-detecting technology, which accurately distinguishes the dog's barking from other noises. It wont be triggered by other dog's barking. Suitable for all sizes dogsAdjustable bark collar for dogs. The diameter of collar belt can be stretched from 1.08 inches to 7.08 inches, which is designed for all 15 to 100 lb, from mini, small, medium to large dogs.