... : compatible the format of IBM and ISORead/write High coercive (2700-4000OE) mag.cardRecord density: track 2: 75BPI/210BPI,Serial communication ... such as banks,taxs, equity markets, commodity inspection, Posts and Telecommunications and so on . An external adapter for power supply is ... one is mini size magnetic card reader,read track 1, track 2,track 3Below is normal size magnetic card reader,just ...