Before revision: An early portable player, a Sony Discman model D121 A Philips portable CD player disassembled A portable CD player is a portable audio player used to play compact discs.
After revision: The internal components of a Panasonic portable CD playerAn early portable player, a Sony Discman model D121 A Philips portable CD player disassembled A portable CD player is a portable audio player used to play compact discs.