Garmin T20 Add-On GPS TRACKING ONLY Collar for ALPHA / PRO 550+

Dynamic Tracking auto-adjusts update rate for longer battery life

Multi-colored LED running lights help you ID your dogs in the dark

"One-size-fits-most" design fits comfortably on small or large dogs

Automatic software updates while charging when connected to WiFi

Also compatible with ASTRO 430 handhelds