Motorola razr v3c ユーザーガイド

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Setting Up Your Phone
Conserving Battery 
Power
Your phone includes an ambient light sensor 
and battery save setting to extend battery life. 
When this feature is activated, it automatically 
turns off the keypad backlight when it detects 
that enough ambient light is available. 
Inhibiting or covering the sensor can cause 
intermittent backlighting.
Find it: Press s > w Settings > Initial Setup 
>
Battery Save