Suunto Spartan Trainer Wrist HR User Guide - 1.10

Backlight

The backlight has two modes: automatic and toggle. In automatic mode, the backlight comes on with any button press. In toggle mode, you turn the backlight on by keeping the upper left button pressed. The backlight stays on until you keep the upper left button pressed again.

By default, the backlight is in automatic mode. You can change the backlight mode from the settings under General » Backlight.