The Astro 430 tracks up to 20 dogs at a time. 2.5-second update rate provides faster location tracking when dogs are on the run, while GPS/GLONASS reception enables better satellite tracking in challenging environments than GPS alone. Intuitive and easy to use, the Astro 430 handheld features a vibrant 2.6-inch color display, preloaded TOPO U.S. 100K mapping, an optional in-unit rechargeable battery and Hunt Metrics data to help analyze your dogs tracking habits in the field, so you can know how to train more effectively. The Astro 430 is tough, water-resistant, and long-lasting. This model includes: Astro 430 handheld, 5-inch standard antenna, 13-inch extended range antenna, USB cable, and belt clip.