The SportDog WetlandHunter 2000 Dog Collar Training Sysytem, with its high-output receiver, has enough power for the toughest waterfowl hunting environments. Both the transmitter and receiver are completely waterproof and submersible. The WetlandHunter can be expanded to control 2 dogs by adding a SportDOG Brand Add-A-Dog collar. Stay hidden. Get wet. Work your dog. Bag birds. What else is there? Receiver and transmitter are waterproof and submersible.