Which e-reader product launch included a groundbreaking feature that allowed readers to access books anywhere through built-in cellular connectivity, requiring no computer or WiFi?

The publishing industry was forever changed with the introduction of e-readers, transforming how we consume literature. These digital devices disrupted traditional book retail while creating new publishing opportunities and reading experiences. This poll tests your knowledge about a pivotal product launch that reshaped the literary marketplace and consumer reading habits. Do you know which breakthrough device changed the game for digital reading?

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Amazon Kindle (1st generation) with 'Whispernet' technology (2007)
Barnes & Noble Nook with 'GlowLight' technology (2009)
Sony Reader PRS-500 with 'E Ink' technology (2006)
Apple iPad with 'iBooks' application (2010)