Aetertek At-216D-550M 100% Waterproof Rechargeable Electronic Dog Shock Training Collar with Remote 7 Levels of Shock Beep Vibration Upgraded 216D.600Yard (550 meters) remote control range, and signal can pass through obstacles, such as walls and fences. 100% waterproof rechargeable receiver (dog can swim with it ),Remote with auto sleep feature ,save battery. 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. Adjustable TPU strap, it is suitable for small, medium and large dogs weighing from 15 to 150 lbs. 3 modes: Warning Beep Tone, Strong Vibration, 7 levels of adjustable Shock. 216D system can support to train up to three dogs separately. Static shock at the highest intensity is adequate for extra large or stubborn dogs, and mildest shock will not harm even the smallest dogs.Aetertek match and got all necessary certification which meet USA and EU standard, such as CE, FCC, RTTE, ROHS and so on.