Forerunner 55; Power-Data Cable; Documentation

Easy-to-use running watch monitors heart rate (this is not a medical device) at the wrist and uses GPS to track how far, how fast and where you’ve run
Battery life: up to 2 weeks in smartwatch mode; up to 20 hours in GPS mode
Plan your race day strategy with the PacePro feature (not compatible with on-device courses), which offers GPS-based pace guidance for a selected course or distance