(trademark) a pocket-sized stereo system with light weight earphones
"After finishing his run, he popped an old Walkman into his bag to listen to his favorite tapes on the way home."
A portable personal audio cassette player with headphones.
"I found an old Walkman tucked in my grandmother's attic, even though I usually prefer lowercase when typing about it."
Alternative letter-case form of walkman
A Sony portable personal compact cassette player product line
"He pulled out his vintage Walkman from 1985 to show me how the original Sony compact cassette player worked before digital music existed."