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If built to spec, the backlight will shut off after the timeout set in the programming. Default is 7 minutes. I set mine to 3. After that it is hard to read. The screen on my Celeb mpguino does not totally shut off, but it does not use the recommended display either.
The constant power supply is needed to retain the program and settings. Like the clock and presets on the radio.
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Winter daily driver, parked most days right now
Summer daily driver
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