Hoist Fitness LeMond pilot II Manuel D'instructions page 19

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Pressing the light key will back-light the display window for
5 seconds. If another key is pressed while the light is on, the
back light will stay on for an additional 5 seconds. As long as
keys are pressed with the back light on, the console light will
stay on.
Note: When the back light is on, all calculations are suspended.
During this time, heart rate and cadence are not detected.
Page 19