CatEye's Strada Smart connects with your smartphone so you can view your ride data while your phone stays safely in your pocket with its battery life preserved. Simply download the CatEye Cycling App and the Strada Smart will display current/average/max speed, distance traveled, altitude, and more. CatEye's speed/cadence sensor (included) and heart rate monitor (sold separately) track your efforts even closer. After a tough ride come back and upload your data to CatEye's Atlas, Training Peaks or Strava to compare your workout to previous rides or your friends' times. And, if you leave your phone at home, the Smart also works by itself with the Bluetooth sensors.