When pressed, the light button will brighten the 7 segment display, LEDs, and turn off the backlight on the keypad.
When the 7-segment display is brightened and the backlight is powered off, the unit consumes battery life at twice the rate of the mode with the keypad backlight on, and the 7-segment display at reduced brightness. When the module is powered on, it always defaults to the lower power consuming mode.
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