Dynamic performance monitoring provides insights on your VO2 max, recovery, training balance, heat and altitude acclimation, nutrition, hydration and more when paired with compatible sensors Cycling safety features include new bike alarm, group messaging and tracking, and compatibility with Varia rearview radar and lights so you can see and be seen (when paired with compatible smartphone) Includes routable Garmin Cycle Map with popularity routing. Which helps you ride like a local, plus off-course recalculation and back to start; mountain biking model has integrated Trailforks data Customize with free apps, widgets and data fields from the Connect IQ Store MTB dynamics track jump count, jump distance, hang time and Grit, a measure of the ride’s difficulty, and Flow, which tracks the smoothness of your descent so you have a score to beat next time Battery life: up to 20 hours with GPS; works with Garmin Charge power pack for up to 40 hours of additional battery life