Aetertek At-216s 100% Waterproof Training Collar for Dogs with Remote 550m Shock Collar Rechargable for 1 Dog Aetertek most classical model 216D dog remote shock collar. 550 meters remote control range , and signal can pass through obstacles, such as walls and fences Small & lightweight rechargeable receiver. 100% waterproof, dog can swim with it. Adjustable TPU strap, it is suitable for small, medium and large dogs weighing from 15 to 150 lbs. 3 modes: Warning Beep Tone, Vibration, 7 levels of adjustable Shock. 1 year warranty is guaranteed. Static shock at the highest intensity is adequate for extra large or stubborn dogs, and mildest shock will not harm even the smallest dogs