3.5" bike computer with comprehensive navigation, performance and cycling awareness features, Trendline popularity routing uses billions of miles of Garmin Connect ride data to show the best on- and off-road routes, Preloaded Garmin Cycle Map provides turn-by-turn directions and new navigation alerts, New rider-to-rider messaging1 lets you stay in contact with other cyclists in your group, Challenge yourself every ride with newly updated preloaded Strava Live Segments feature, Battery life: up to 20 hours2, extendable up to 40 hours with the optional Garmin Charge power pack.