With Garmin speed and cadence sensors, you measure and analyze your cycling performance very accurately. A speed sensor measures your speed much more precisely than GPS does. You're not dependent on a GPS signal that stops measuring when you stop in front of a traffic light. Garmin's cadence sensor measures your pedaling revolutions per minute. This way, you maintain your ideal pace, which prevents injuries or a high heart rate. Your data is sent to your bike navigation system or sports app on your smartphone, such as Garmin Connect or Strava, via Bluetooth or ANT+. This gives you insight into your cycling performance so that you get the most out of your training or competition.