Xvolt Bark Collar Dog Bark Collar Rechargeable with Beep Vibration and No Harm Shock,Rainproof,5 Levels of Sensitivity, Anti Barking Collar for Mini Small Medium Large Dogs Adjustable Sensitivity5 training levels are prepared for your dogs, and the anti-bark collar is easy to use without harm. You can choose the most appropriate sensitivity based on the actual condition of your dogs. Finally, you can control your dogs without any tools! Automatic Self-protective ModeWhen barking collar was activated continuously 7 times, it will light to remind his master. If dog is barking for over 30 seconds, the dog barking collar will stop working to avoid hurting dogs. Convenient for the owner, harmless for the dog. For All Size Dog Whether your dog is big or small, you can adjust the collar made by the stretch fiber to fit your dog perfectly. The bark collar is designed for 6.6 to 66 pounds of mini, small, medium and large size of dogs, which can stretch from 1.08 inches to 7.08 inches. Humane & IntelligentOnly your dogs barking can trigger the bark collar while others cannot trigger it. Also, the intelligent barking detection system can protect your dog from getting punishment by mis-trigger. Let this shock bark collar help you finish the training task for correcting dogs misbehaviors. Rechargeable & RainproofRechargeable bark collar is equipped with USB charging cable and energy-saving design. Charge for 1 hour, and the built-in li-ion rechargeable battery can use for about 14 days. Waterproof design allows your dogs to run in the rain to release their nature!