Yup, it's as simple as putting a magnetic stripe reader and putting it into a shell. These are a commodity on Alibaba now [1]. The idea of using headphone jac

Yup, it's as simple as putting a magnetic stripe reader and putting it into a shell. These are a commodity on Alibaba now [1]. The idea of using headphone jack for data transfer has been around since the Commodore PCs [2] The software side is pretty standard too [3]. It's a standard analog to digital conversion. [1] http://www.alibaba.com/showroom/headphone-jack-magnetic-card-reader.html http://www.alibaba.com/showroom/headphone-jack-magnetic-card... [2] http://www.zimmers.net/anonftp/pub/cbm/crossplatform/transfer/transfer.html#wire-tape-audio http://www.zimmers.net/anonftp/pub/cbm/crossplatform/transfe... And https://en.wikipedia.org/wiki/Commodore_Datasette https://en.wikipedia.org/wiki/Commodore_Datasette [3] http://www.slideshare.net/ShipengXu/data-transmission-through-audio-jack-on-ios http://www.slideshare.net/ShipengXu/data-transmission-throug...