Replacement transmitter battery kit for Field Trainer 425 and 425S and Wetland Hunter 425CAMO. SportDOG Brand of Knoxville, Tennessee, is a manufacturer of electronic dog training gear and accessories. Product lines include remote training collars, no-bark collars, an in-ground fence system and remote tracking systems. The company also carries training leashes, bells, collar straps, dummies, scents and whistles; TEK Series E-Collar+GPS Location and GPS Location only systems; and Canine Athlete nutritional products.