Aetertek At-219 Updated Dog Shock Collar Rechargeable Dog Bark Collar 600 Yard Remote Shock Control Pet Dog Training Collar Shock Collar with LCD Displayer Auto Anti-bark for 2 Large Dog Training Collar Can be used as 1-1,1-2 remote dog training shock collar (This list is for 2 dog with 2 receiver), you can control your dog separately or at the same time Support serious user with professional and safe correction mode: Vibrate, Beep, Auto no bark mode, LCD display. 0-18 adjustable levels for shock Rechargeable transmitter & Rechargeable 100% waterproof collar receiver, can be immersed in water when your dog is swimming Remote control dog trainer range up to 600yards (approx. 550 meters) and signal can pass through obstacles, such as walls and fences Adjustable strap fits 6-25"/15cm-65cm neck size, suitable for all dog size from 15-150lbs