The IDTech UniMag II is a magnetic stripe reader that communicates with mobile devices via the headphone jack. The UniMag II allows you to use your mobile device to read a variety of magnetic stripes, including credit cards, signature debit cards, gift cards, and loyalty cards. The UniMag II utilizes IDTechâ€™s proven MagStripe reading technology, providing bi-directional card reading of up to two tracks of information. When reading card data the UniMag II encrypts the information before it enters the mobile device, providing protection of sensitive data. With the IDTech UniMag II, merchants can accept credit card payments wherever they go.