SportDOG 425 Series Transmitter Battery Kit - This SportDOG Brand Transmitter battery kit for YardTrainer and SD-425 Series transmitters includes a rechargeable battery, Operating Guide, gasket, and screwdriver. FieldTrainer 425, (SD-425), 425S (SD-425S), 425X, (SD-425X), 425XS (SD-425XS) (FT-125 transmitter) WetlandHunter 425 (SD-425CAMO), 425X (SD-425XCAMO) (FT-125W transmitter) YardTrainer 100/100S/300 (YT-100, YT-100S & YT-300) Rechargeable Battery Operating Guide Gasket Screwdriver