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