SUUNTO T1C User Guide - Manual (Page 28)

7 GENERAL FEATURES
7.1 Backlight
You activate the backlight by pressing [Light -]. The backlight turns off automatically.
If you want to use the backlight when changing settings, you need to activate it before
entering the settings. The backlight will re-activate whenever a button is pressed. This
feature will stay on until you exit the settings.
NOTE: Heavy use of the backlight significantly reduces battery life. To save power,
backlight blinks when used in TRAINING mode.
7.2 Button lock
You can lock and unlock the buttons in any mode by keeping [Light -] pressed.
When the buttons are locked, you can still change views and turn on the backlight.
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