Aetertek Pet Dog Bark Shock Collar Electric E-Collar Remote Training System Tool Shock+Vibration+beep Waterproof Rechargeable Aetertek 216D 1 dog shock collar. Can be upgraded to a 2 or 3 remote dog training collar systems by adding one or two dog collars 3 modes: Warning Beep Tone, Strong Vibration, 7 levels of adjustable Shock. Aetertek collar use the most advanced design, electromagnetic induction switch solution, on the power ON/OFF switch to ensure unlimited accurate switch, more convenient and reliable. 100% waterproof rechargeable receiver (dog can swim with it ) Fit for dogs weighting from 15 to 150 pounds with a collar size from 12 to 24 inches long. 600Yard (550 meters) remote control range. 1 year warranty