Citizen Eco-Drive Satellite Wave F900 - Watch Features and Technology; Satellite Wave-GPS Functionality; Eco-Drive and Light-Level Indicator

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Light-Level Indicator
Indicates current power generation amount in 7 levels.
It can be used as a reference for choosing a good charging place.
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Eco-Drive
Never needs a new battery. This watch is fueled by light.
Features
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Satellite Wave-GPS
Receives location and time information sent from
GPS satellites and adjusts the time and calendar on
the watch automatically.