Garmin Edge 820 takes Cycling GPS computers to a new levelEdge 820 has performance features:VO2 estimate, Recovery Advisor, Strava Live Segments, Performance Condition, Stress Score, Advanced Cycling Dynamics, FTP and Watts/kg trackingEdge 820 Performance is also Wi Fi compatible for complete ease of data transfer, only plug in to charge!Ambient light sensor manages battery savingEdge 820 / Edge 820 Explore Common FeaturesGroup Track feature means you can keep in touch live with those around you with on screen monitoringThere is a new high resolution touchscreen display for ease of useThe screen is maxed to the unit resulting in an impressive 2.3 inch high resolution capacitive touch display that works with gloves and when wetLightweight and compact;offering most Edge 1000 features without the bulkCompatible with Garmin Connect IQ; to download free custom apps and data fieldsGPS plus GLONASS satellite reception and Barometric altimeterPreloaded Garmin Cycle Map for turn by turn navigation, including RoundTrip Course creator and on device course planningUsing Bluetooth the system has connected features, including automatic uploads, live tracking, send/receive courses and social media sharing, audio prompts and weatherSmart notifications allow you to receive text and call notifications while ridingIncident Detection via an Integrated accelerometer for Incident detection on the roadAllows automatic or manual sending of location message to emergency contacts if you need assistancePair with Varia radar to see vehicles approaching from behind on screen or Varia Vision to get in-sight display of key dataNew extended battery life for longer, more adventurous rides - up to 15hrs in GPS training mode, and new Battery Save mode will extend battery life by up to 50%