Which groundbreaking feature did Sony specifically REMOVE from the original Walkman prototype to make it commercially viable and revolutionize portable music?

Sony's Walkman revolutionized how we experience music, transforming listening into a personal, portable experience. This iconic product innovation from 1979 changed the music industry forever and laid the groundwork for today's streaming culture. Test your knowledge about this game-changing device that put music in our pockets decades before smartphones existed!

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• Recording capability
• FM radio function
• Rechargeable battery
• Built-in speaker

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