Aetertek Pet Dog Shock Collar Training E-collar Auto anti bark Professional for Sport Large Serious Stubborn Dogs Aetertek durable product,can fit for large,serious and stubborn dogs. Use electromagnetic induction switch solution,on the power ON/OFF switch to ensure unlimited accurate switch, more convenient and reliable. 100% waterproof and rechargeable collars.Excellent on pre-sale and after-sale service, one year unconditional quality warranty. All of our effort are for pets and our users. Electric remote range up to 550M.Support to train two dogs at the same time or separately. Collar features Auto Anti Bark, vibrations, beeps and 9 levels of progressive shock.