Walkman

Walkman is a  Sony brand tradename originally used for portable audio  cassette/tape players in the late 1970s

Smurf Me Up
In the Smurf Me Up series, the Walkman was created by the former Sunwalkers as a means for recording sound through the use of Cassette tapes.

In the Revelations story, Anastesius carries a walkman with him on his journey to record conversations, and then to listen to them later. Zowfee and Seven used their own Walkman to record their interrogations of Avarice and Sniper Jing.

In the Revelations mini-story The Truth, Glovey Smurf is given a Walkman after awakening from his coma, which he uses to send a Thank You message to Anastesius, from "The Smurf Who Sold The World." Later, Glovey finds it creative to record music and songs with it.

Trivia

 * The model used in the Smurf Me Up series is based on the WM-FX141 model by SONY, which is the same one owned by user Enriquearreguin777.