Aetertek AT-918C Waterproof Remote Dog Training Shock Vibration Beep Collar Stops dog's unwanted bad behavior. Collar features vibrate, beeps and 9 levels of progressive electric static shock. Safe and effective. Very humane dog training collar, strong vibration stops dog's bad behavior 99% of the time. Waterproof collar receiver. 100% waterproof and rechargeable collar and goes up to 600 yards in range. Fits all small, medium and large dogs from 15 to 100 pounds with a collar size from 8 to 26 inches long. Automatic no bark feature. Comes with an automatic bark function feature.