Aetertek At-918-2 Rechargeable Dog Bark Collar with 550m/ 600 Yard Remote Range Dog Shock Collar 100% Waterproof Training Collar Submersible Shock Trainer for 2 Dogs Training Used as 1-1,1-2 remote dog training shock collar (This list is for 2 dogs), training your 2 dogs individually or at the same time Submersible (100% waterproof) dog trainer, can be immersed in water when swim Provide professional and multi-functional safety correction mode: Vibrate, 0-9 adjustable levels of Shock, Beep, Auto anti bark Remote control up to 600yards (approx. 550 meters) for all dog size from 15-150lbs Adjustable strap fits 6-25"/15cm-65cm neck size, strap's collar is at random shipment