Suunto D4 manual Setting the backlight, Setting the tones

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4.1.6. Setting the backlight

Use the BACKLIGHT SETTING mode to turn the backlight on or off and to define how long it stays on for (5, 10, 20, 30, or 60 seconds). When the backlight is turned off, it does not illuminate when an alarm sounds.

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4.1.7. Setting the tones

The TONE SETTING mode allows you to activate or deactivate the tones.

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