Essential features in one compact package. The Polar RC3 GPS tracks your route, speed and distance using built-in GPS. It shows GPS based altitude during and after training. The Training benefit gives you instant feedback after your session and the running index scores your performance. Improves performance with endurance training programs, downloadable for free from polarpersonaltrainer.com. Compatible with Polar running and cycling sensors. Rechargeable battery, 12 hours in continuous use with GPS on. In the box: Polar RC3 GPS training computer, USB cable, and RC3 GPS getting started guide.