Aetertek At-216w Waterproof Rechargeable 2 Dogs Training Collar Remote 600 Yard 7 Level Shock, Vibrate Beep Correction Sportdog Training Range 15 to 150lbf 600Yard (550M)remote control range,remote with auto sleep feature,save battery For 2 dogs training shock collar,can be trained up to 3 dogs with add more one 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. Rechargeable & water-proof receiversave $$$ on buying replace battery.