The SportDog Field Trainer SD-400S offers all the features of the SD-400, but is an electronic dog collar specially designed for tougher, more stubborn dogs.
The SportDog Field Trainer 400S is ideal for training in the yard, field, or for hunting with dogs that hunt closely to you. Both the transmitter and receiver are waterproof and submersible. It 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.