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The Square Card Reader could be the best or worst invention ever, depending on your spending habits. This crafty little cube plugs into the headphone jack of your iPhone or Android mobile phone and lets you run your card to your heart’s desire.

The Square Card Reader sounds too simple to be true. Simply swipe your debit or credit card and sign your name on the screen and your mobile transaction is complete. This is a great idea for people who never carry cash or just want to pick up something while they’re out and about.

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