Which revolutionary invention was initially rejected by its target market because the inventor refused to include an essential feature, claiming it would make the product 'too complicated'?

Some of the most innovative products in history were initially considered failures or faced significant rejection. This poll tests your knowledge about groundbreaking inventions and discoveries that struggled at first but eventually transformed our world. Can you identify which famous product overcame a particularly unusual marketing challenge?

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Alexander Graham Bell's telephone, which he refused to include a ringing mechanism on
The original Sony Walkman, which Akio Morita insisted should not have recording capabilities
Thomas Edison's light bulb, which he initially sold without an on/off switch
Steve Jobs' first Apple computer, which he insisted should not have a cooling fan