IDTech UniMag (I) is the first mobile credit card reader developed by IDTech that plugs directly into a mobile device 3.5mm audio port.  The IDTech UniMag I has to be used with merchant account credit card processing software or specific software that has integrated the IDTech UniMag SDK you desire to use it with. We can assist you in obtaining the necessary SDK for mobile credit card reader integration for your IDTech Unimag mobile credit card reader. General Information:Size: 30mm x 11mm x 45m mColor: BlackMagnetic Stripe Reader: 3 track bi-directional reading capabilitiesInterfaces: 3.5 mm stereo audio jack.The UniMag is an encrypted magnetic stripe reader that works with various mobile devices. The UniMag reads up to 3 tracks of information with a single swipe in either direction, providing superior reading performance for your mobile device. A merchant account is required to accept credit card transactions. Mobile device not included.