JVC KD-BT1 Instructions Manual page 38

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1 If the power supply is not interrupted by turning off the ignition key of your car, it is recommended to select "Off" to
save the car's battery.
* Some characters or symbols will not be shown correctly (or will be blanked) on the display.
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* 3 Adjustable only when "Dimmer" is set to "Time Set."
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