SportDOG e Collar - YardTrainer 350 Training Collar - Up to 300 yards - Waterproof Collar - 8 Adjustable Levels of Correction - SD-350 The SportDOG SD-350 e collar should be used for dogs that are 8lbs or Larger. Fits neck sizes up to 5- 22 inches. 300 Yard Range. One dog only system. 8 adjustable levels of static correction. Option to Train with Tone Only. DryTek Waterproof Technology and submersible to 25 feet. Low Battery Indicator in both the Transmitter and Collar. Transmitter weighs only 3.3 Ounces. Collar Receiver weighs only 4.6 Ounces with collar strap. Uses NiMh Rechargeable Batteries.