Citizen H504 - Quick Start Feature

[Quick Start Feature]
If the watch has stopped as a result of being insufficiently charged, the second
hand willbegin 2-second interval movement and the watch will begin to run
about 10 seconds after the watch is exposed to light (approx. 500 Ix). (The
time until the hands begin to move varies depending on the model.) Please
note, however, that the watch will stop again if the watch is blocked from the
light and is not sufficiently charged.