Be certain that this fits by getting into your model number.
Collar Receiver simplest, for stubborn dogs; expand your current system or replace an old collar
Compatible with the SportDOG Logo FieldTrainer 425XS (SD-425XS), 425S (SD-425S)
Water-resistant and submersible to 25 feet the use of DryTek technology
Fits dogs 8 pounds or larger with neck sizes five”-22″
Rechargeable lithium-ion battery with 2-hour fast charge; includes a low battery indicator to allow you to know when to charge