Aetertek At-216D-3 100% waterproof Rechargeable 550m Remote Control 3 Dog Training Shock Collar Effective Beep Tone,Vibrate & Adjustable 7 Level Shock Correcting Smart Stubborn Dog, Pet Dog 550 meters remote control range,signal can pass three ,wall ,fence etc For 3 dogs training shock collar,rechargeable 100% waterproof receiver 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. Static shock at the highest intensity is adequate for extra large or stubborn dogs, and mildest shock will not harm even the smallest dogs