DYNAMIC TRACKING AUTO-AJUSTS 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 WiFiALSO COMPATIBLE WITH ASTRO 430 HANDHELDS