Garmin Astro 220 Dog Tracking GPS Bundle with DC40 Wireless Transmitter Collar (Discontinued by Manufacturer) Bundle includes Astro 220 handheld GPS device, DC 40 dog GPS collar, and accessories Rugged, orange polyurethane DC 40 collar pinpoints your dog's position every 5 seconds Astro handheld has all the features of Garmin's top-line handheld outdoor devices Accepts downloaded map detail, including TOPO maps with elevation information Barimetric altimeter provides elevation profiles for climbers and hikers