Aetertek UPGRADED VERSION:WATERPROOF 600 YARD REMOTE DOG TRAINING SHOCK COLLAR FEATURING BEEP WARNING, STRONG HUMANE VIBRATION AND ADJUSTABLE SHOCK Can be used as 1 dog, 2 dog or even 3 dog training system (extra collars needed for 2 and 3 dog training); A solid 600 yards of range;Manual Dog Anti Bark Waterproof and Rechargeable dog collar receiver, save $$$ on buying replaceable batteries; Beep tone function + vibration correction + 7 Levels of progressive shocks;