Sport Dog Add-A-Dog SDR AXF Collar Astro Doors with storm covers are

Doors with storm covers are slotted for crate cooling fans

volume up and down buttons

Standard Chap Sizing:

you have access to a wide variety of premium mapping content that is regularly updated and wirelessly delivered directly to your Alpha® 300 handheld when connected to a wireless network

Designed for Garmin watches with 20 mm compatibility for a proper and secure fit

Sport Dog Add-A-Dog SDR AXF Collar Astro Doors with storm covers areThe Collar Receiver for FieldTrainer 425X, SportHunter 825X and SportTrainer 575E 875E Remote Trainers. Add another dog to your current SportDOG Brand electronic training collar system or replace a Collar Receiver with the SDR AFX Add A Dog Receiver Collar.