SUUNTO T1C User Guide - Manual (Page 10)

In addition, your heart rate is displayed as a graph on the left edge of the screen.
Button lock and backlight
Lock the buttons by keeping [Light -] pressed. Pressing it briefly activates the backlight.
You can still change views and use the backlight when the button lock is activated.
2.3 Menu navigation
Enter menus by keeping [Mode] pressed.
There is one set of menus in Suunto t1/t1c.
Scroll through the menus using [Lap +] and [Light -].
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