Open the Square app and navigate to Settings>Hardware>Square Card Readers. Once you’ve reached this point, click the power button on the card reader, triggering it to enter pairing mode.

For a product like the new Square Reader–a sleek update to the familiar credit card-swiping dongle that's nearly twice as thin as its predecessor–most of the design work is out of sight.

Our comprehensive review of Square's card reader, point of sale equipment, and software. Find out if it’s right for your small business.

Square’s hugely practical card reader can be used on its own or to supplement your static business by allowing the processing of mobile card or contactless payments on the go. Why you can trust ...

Headline updated to acknowledge that Square is a US-only service for now. Remember the Square card reader and payment service from our first hands-on video in January at Macworld Expo 2010? Square ...

When investigating the Square card reader, I have learned that Square requires a Social Security number for an account. Why do they need that info, and is it safe to give it to them?

Businesses accept credit cards by choosing a processor, setting up a business bank account and selecting payment hardware like POS systems or mobile readers.

‘How do we know? We did it. Tested on sample Square card readers with our own personal credit cards, we wrote an application in less than an hour that did exactly this.’ ...