Citizen CC4054-68L Instruction Manual page 6

Features
■ Light-Level Indicator
Indicates current power generation amount in 7 levels.
It can be used as a reference for choosing a good charging place.
■
Eco-Drive
Never needs a new battery. This watch is fueled by light.
4
■ Satellite Wave-GPS
Receives location and time information sent from
GPS satellites and adjusts the time and calendar on
the watch automatically.