Radio Shack 22-1680 - Manual (Page 16)

16
DIMMING THE DISPLAY
To dim the display, hold down PWR for 2 seconds. The detector
displays DIM , then the display dims.
To make the display black out, hold down PWR for 2 more sec-
onds. The detector displays DARK . The display dims when it is
not detecting a signal, and blacks out entirely while it is receiv-
ing a signal and for 20 seconds after the signal.
Hold down PWR for 2 more seconds to restore the display to
full brightness.