Camoflauge version of the SD-400. This dedicated waterfowl product is rugged, waterproof, and submersible in an unbelievably compact size. Both the Transmitter and Receiver are waterproof, submersible, and camoflauge. It comes as a 1-dog system, but can be expanded to control up to 3 dogs by adding SportDOG Brand Add-A-Dog™ collars. The comfortable "soft coat" Transmitter finish makes this unit a pleasure to handle. Dog Training Gear the way you'd design it.