AeterTek AT-218 Electronic Training Collars x2 100% Waterproof, for retreivers. Long Range (550 metres) Auto Bark-Stop; 9 levels of: Beep, Vibrate, or Shock 1 transmitter controls Dog1, Dog2, or both simultaneously. 9v alkaline in Transmitter, Rechargables in Receivers. Best equivalent at Amazon for 500m range set with 2nd collar $400. Asking $160 firm.