The SD-400S has the same features as the the SD-400. It is specifically designed for hard to train, stubborn dogs. The SportDog FieldTrainer dog training collar is ideal for training in the yard, field, or for hunting with dogs that hunt close. This electronic dog training collar is compact and easy to use. 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. Dog Training Gear the way you'd design it. The SD-400S is specially designed for tougher, more stubborn dogs. SportDog SD-400S Stubborn Dog FieldTrainer Features: 400 yards range This is a one dog system and comes with one transmitter and one collar Waterproof transmitter Waterproof receiver Up to 16 levels of continuous and momentary stimulation Tone only button Low battery detect feature in both transmitter and receiver

Replaceable, rechargeable NiMH batteries Very small transmitter (3.2 oz.) Receiver, collar/strap and battery combined weigh 3.5 oz Lanyard Lifetime Limited warranty