SportDOG SDR-AXS Add A Dog Collar Receiver

The Collar Receiver for FieldTrainer® 425XS Stubborn Dog Remote Trainer. Add another dog to your current SportDOG Brand® electronic training collar system or replace a Collar Receiver with the SDR-ASX Add-A-Dog® Receiver Collar. Features:•    Collar Receiver only, for stubborn dogs; expand your current system or replace an old shock collar•    Compatible with the SportDOG Brand FieldTrainer 425XS (SD-425XS), 425S (SD-425S)•    Waterproof and submersible to 25 feet using DryTek technology•    Fits dogs 8 pounds or larger with neck sizes 5"-22"•    Rechargeable lithium-ion battery with 2-hour quick charge; features a low battery indicator to let you know when to charge