Garmin Edge 520 Bike GPS Offers in-ride challenges through Strava live segments ; Water rating is IPX7. Reports cycling-specific VO2 max and recovery time when used with power and heart rate Pairs with compatible ANT+ indoor trainers for data display and control.Battery life	up to 15 hours Tracks Functional Threshold Power (FTP), watts/kg and cycling dynamics when used with Vector or Vector 2 power meters. On-device segment compatibility for dynamic and engaging in-ride competition Connected features: automatic uploads, live tracking, smart notifications, send/receive courses, social media sharing, weather Display resolution is 200 x 265 pixels. Android requirements is 4.4 os or later. Bluetooth 4.0 or later. Apple requirements is ios 10.0 or later, compatible with iphone, ipad and ipod touch