Aetertek At-216s 100% Waterproof 2 Dogs Training Electronic Shock Collar with Vibration Beep Correct Remote 550m 7 Levels Shock Rechargeable 550 meters remote control range For 2 dogs training shock collar 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