: The first four characters before the hyphen (e.g., E111 , H800 , U680 ) are what you need.
is much weaker than sunlight; it may take significantly longer (up to several days) to achieve a full charge under office lights compared to just a few hours outdoors. citizen eco drive gn4ws12g manual link
For troubleshooting performance issues, visit the Citizen UK Help Centre for common fixes. Video Resources for Visual Learners : The first four characters before the hyphen (e
: Look at the case back for a string of characters (usually 4 digits, a hyphen, and 6 or 7 more characters, like E111-S022240 ). Video Resources for Visual Learners : Look at
Since these watches are powered by light, they do not require battery replacements. If your watch has stopped or is losing time, Citizen recommends exposing it to for several hours.