An effective bark stopper that will make your dog friendly and quiet, with 3 alert or warning modes: Beep, Vibration, Shock, adjustable from 0-7 levels of intensity, choose what suits your dog better, where possible it is recommended not to use the Shock mode, or set a low intensity level, that is the warning and lesson mode. The dog shock collar is adjustable between 8 and 25 inches for small, medium and large dogs 10-100 lbs. This anti barking device has contain rechargeable lithium batteries, charging 2-3 hours, the normal use time of 11-15 days. The E collar for dogs is equipped with conductive silicone and metal contact pieces that provide a stronger connection to your dog's skin, protecting your dog from skin damage.