Edge 500 is compatible with ANT+™ heart rate monitors, speed/cadence sensors & third-party ANT+ power meters. It also features advanced calorie computation based on heart rate information for more accuracy. Edge 500 uses a high-sensitivity GPS receiver with Hot Fix™ satellite prediction to calculate your position faster. It also has temperature readings & a start notice that warns you if the timer is not going when you begin moving. Edge 500 features a low-profile, quarter-turn mount that fits on your bikes stem or handlebar. Once your ride is complete, upload the workout to Garmin Connect™ for detailed analysis & mapping. Click here to see a larger version of the Garmin Edge Comparison Chart.