Maserati Solar Serie Manual De Instrucciones página 45

POWER DEPLETION WARNING FUNCTION
When the energy stored in the secondary battery is reduced to an extremely low level, the se-
cond hand starts moving at two-second intervals instead of the normal one-second intervals.
In that case, recharge the watch as soon as possible by exposing it to light. Otherwise, the
watch may stop operating in about 2 weeks.