Posiflex SD300 USB Magnetic Stripe Reader. Combined with the Hybrid POS HT series touch terminal, the SD300 provides either a two-track or three-track MSR, with or without the fingerprint module. The fingerprint sensor is NOT included but can be added at a later date, in the field, by replacing the blank face-plate with one that contains a U.are.U fingerprint sensor. A single USB connector accommodates both devices thereby preserving an additional USB port for other peripherals.