The garmin edge 820 performance gps unit only has all the features of the edge 820 performance bundle but does not include the heart rate monitor cadence sensor or speed sensor this will be ideal for those who already have all of these accessories but are looking to upgrade their garmin unit whether your goal is to beat yesterday with a faster or longer ride or dial in your training for a race the garmin edge 820 puts the features you crave at your fingertips this compact to