National Geographic NG752 SERIES, Инструкция по эксплуатации

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Push button D turns on the electroluminescent (EL) light. A
timer keeps the EL light on for three seconds after the push
button is released.
When the EL light is on, any action on A, B, or C will switch
on the EL light for three more seconds.
Note: The EL light only illuminates the digital portion of the
watch.
Push button D
D
6