Module No. 5719
Viewing the Face in the Dark
The watch has an LED light that you can use to illuminate the display for about 1.5 seconds for viewing in the dark. When turned on, illumination becomes gradually brighter and then gradually dimmer.
You can turn on the light in the Timekeeping Mode or Alarm Mode.
Turning On Illumination
Pressing (B) turns on the light.

Illumination will turn off automatically if an alarm starts to sound.
Illumination is disabled while the hands are moving at high speed.