Polk Mono UM1 Installation And Operation Manual page 12

UM1
Liquid Crystal Display (LCD)
The current frequency and activated functions are shown on the LCD panel (10).
NOTE: LCD panels may take longer to respond when subjected to cold temperatures
for an extended period of time. In addition, the visibility of the numbers on the LCD
may decrease slightly. The LCD display will return to normal when the temperature
increases to a normal range.
Back Key
(swoop arrow)
In various modes and conditions, the swoop arrow option will be available in the lower right
soft button. Press button to exit the current operation without waiting for the system default
time out and returning to the previous menu display.
10