When the pedal turns on by spinning the pedal body the LED will flash once for the first ten revolutions to indicate cadence and that the pedal is working correctly. If the LED does not flash check and if no dirt inside the hex pocket is blocking the LED and if the pedal is fully charged. If a Bluetooth connection is established, the LED flashes repeatedly for 1-2 seconds. This indicator helps to see which pedals are getting connected and if the connection was successful.