Complete Replacement Kit: The SportDOG SD-425 Series Transmitter Battery Kit includes a rechargeable battery, gasket, and screwdriver for easy DIY battery swaps and long-lasting reliable performance Compatible with SportDOG Brand SD-425, SD-425S, and SD-425CAMO handheld remote transmitter Includes rechargeable battery, gasket, screwdriver, and operating guide Built for the Field: SportDOG gear was designed by professionals who demand durable, no-nonsense tools that perform in real-world conditions without fail Trusted by Serious Trainers: Professionals rely on SportDOG for proven performance, consistent control, and expert-backed training guidance that gets results