Twitter's founder Jack Dorsey said the device, the "Square," aimed particularly to enable small transactions for "people like babysitters, dog walkers, golf instructors, flight instructors" to collect payment.
The small black square plugs into the mobile's microphone socket, turning it into a card reader like the swipe machines widely used in US shops and restaurants. Its official launch is set for March.
View more at our post on Ask An Expert at: http://experts.medici.com.au/articles/view.php?id=142
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