The SportDog SDR-AXF Add-A-Dog Collar Receiver is the original collar receiver that comes with the FieldTrainer 425X and the SportHunter 825X. This SportDog add-a-collar has waterproof design technology. Add another dog to your current SportDog electronic collar system or replace a collar receiver with the SDR-AXF Add-A-Dog Collar Receiver.

The SportDog SDR-AXF Add-A-Dog Collar Receiver is compatible with:

• FieldTrainer 425 and 425X
• SportHunter 825 and 825X
• SportHunter 1225
• ProHunter 2525
• HoundHunter 3225

Free shipping on this product.