When Square (now Block, Inc.) launched its first mobile card reader in 2010, what unique physical characteristic made it revolutionary for small businesses?

Square, Inc. (now Block, Inc.) transformed small business payments with its iconic card reader. This poll tests your knowledge about this retail payment technology pioneer that enabled countless small merchants to accept credit card payments without traditional merchant accounts or expensive equipment. Test your knowledge about this game-changing retail payment system!

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It plugged into a smartphone's headphone jack, turning phones into payment terminals
It used solar power, eliminating the need for batteries or charging
It communicated via Bluetooth with specialized receipt printers only
It could only process payments when connected to Square's proprietary tablet device