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 Durable & Ready for Action: Built with rugged, durable collar material and DryTek waterproofing up to 25 feet for confidence in wet, muddy, and demanding terrain Rechargeable & Adjustable Fit: Includes a quick-charge battery and a custom-fit training collar for dogs 8 lbs and up, with a 2-hour charge time and 50–70 hour runtime 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