LeMond RevMaster Pilot - Manual (Page 20)

Page 20
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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 and heart rate and cadence is
not detected.