Could someone explain the meaning of these specs on my dryer?

Whirlpool model# wed4815ew1
120/208v 24A 60Hz
120/240v 26A 60Hz

It has two ratings, one right below the other, on the dryer itself. It has a NEMA 10-30R plug. I want to know how much actual amps it's going to use from the wall, and how many volts.
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