Does the Casio MRW-210H-3AV have a light?

No. There is no backlight or lume on the hands, so reading it in the dark is difficult.

Casio rates it for everyday water resistance, enough for hand washing and rain, but not for swimming or diving.

What does the rotating bezel do?

It is a manual timing bezel. You line the marker up with the minute hand and read elapsed minutes off the scale.

Yes. A day-date window sits at 3 o'clock and shows both the day of the week and the date.

It gives up alarms, stopwatch and a light for an analog face and a timing bezel. Choose it for looks and simplicity, not functions.

A standard quartz battery, which Casio rates for roughly three years of use before replacement.

At CASIO, for $45.95, as of our latest check.

$45.95at CASIOChecked Nov 10

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