DigiTech HARDWIRE HT-2 Owner's Manual page 9

9. LED Indicator - Lights when the effect is turned on. When battery
power is low (approximately 15 minutes before it dies), the Indicator
LED begins to dim giving you advanced warning that very shortly you
will need to replace the battery.
10. Note Display - Displays the note being tuned. The decimal point in
the lower right corner of the display will light to indicate the sharp of
the note is played (i.e. G. = G#).
11. Tuning LED Array - These eleven LEDs are used for displaying
whether the note being tuned is sharp or flat. They are also used to
indicate tuning references and tuning LED array modes.
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