How does the radio timekeeping work?

The watch receives a time-calibration signal and corrects itself, so you don't set it by hand. Reception depends on where you are; it may not sync indoors or far from a transmitter.

Do I ever need to change the battery?

It runs on a solar cell that charges from light, so a battery change is rare. Keep it exposed to light regularly, especially if you store it in a drawer.

Does it handle travel and time zones?

Yes. It offers world time for major cities and multiple alarms, which suits people who travel or work across time zones.

Is it good for swimming?

Casio rates this line for everyday water resistance rather than diving. It handles rain and handwashing, but check the caseback rating before swimming.

How does it compare with a plain analog quartz watch?

It adds radio sync, solar power and a digital display on top of standard analog timekeeping. A plain quartz watch is simpler but needs setting and battery changes.