SUUNTO LUMI - Manual (Page 14)

in MENU , you will need to activate it in the TIME , ALTI & BARO or COMPASS mode
before entering MENU . The backlight will then be activated until you exit MENU .
NOTE: Heavy use of the backlight will significantly reduce battery life.
4.6 Activating button lock
You can activate and deactivate the button lock by keeping [Down Light]
pressed down. When the button lock is activated, it is indicated with a lock
symbol .
NOTE: You can change views and use the backlight when the button lock is
activated.
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