Quick-Charge Adaptor: The SportDOG Charging Adaptor is compatible with SD-425 family and 825 remote trainers, simultaneously charging transmitters and receivers in 2 hours; fits standard outlets Streamlined Operation in the Field: Our training systems are designed for instinctive, no-look use for customized training Durable & Field-Ready: Built for wet, rugged conditions, our remote trainers are weatherproof and include a durable e-collar system 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