Image source: https://www.downunderwatches.com/wp-content/uploads/2017/09/AT9085-53E-510x600.jpg What it does primarily:
Syncs to the atomic clock every night. Thats radio-controlled.
Keeps track of dates by itself odd/even months and leap years. Thats perpetual calendar.
Tracks time without sacrificing accuracy in 26 Cities besides showing UTC. Thats World Clock.
Changes to Daylight Savings Time automatically when required. Thats DST-feature.
Runs without battery replacement, creating power from light. Thats Eco-Drive.
An elaborate explanation:
Apart from the above, the Caliber H145 inside the Citizen Eco-Drive Radio Controlled Perpetual Calendar World Time CB0141-55E Mens Watch combines innovative technology to its most useful application for anyone dealing with more than one time zone. It is a very advanced, radio-controlled movement providing an unmatched accuracy in time-keeping and time-tracking. The black and silver combination of the Citizen Eco-Drive Radio ...