The original Collar Receiver for FieldTrainer 425 and SportHunter 825.
Add another dog to your current SportDOG Brand electronic training collar system or replace a Collar Receiver with the SDR-AF Add-A-Dog Receiver Collar.
Comes with a convenient docking station that charges the collar in 2 hours.
Compatible with

FieldTrainer 425 (SD-425), 425S (SD-425S)

SportHunter825 (SD-825), 1225 (SD-1225), 1825 (SD-1825)
WetlandHunter 425 (SD-425CAMO), 1825 (SD-1825CAMO)
ProHunter 2525 (SD-2525)

HoundHunter 3225 (SD-3225)
UplandHunter 1875 (SD-1875)