Aetertek At-211s-1 100% Waterproof 1 Dog Training Shock Collar Remote 400 Yard Rechargeable Warm Beep Tone, Vibrate & 9 Levels Shock Correct Bad Habits Can be used as 1 dog, 2 dog training system (extra collars needed for 2 dog training) A solid 400 yards of range,1 year warranty 100% Waterproof dog collar receiver, transmitter with auto sleep feature save battery Environmentally friendly---Rechargeable receiver, save $$$ on buying replaceable batteries Beep tone function + vibration correction + 9 Levels of progressive shocks