... , magnetic card reader ( USB interface,3 traks.compatible with windows 7, xp, linux, mac OS) 2.excellent quality KSI - MSR-210 ... , magnetic card reader ( USB interface,3 traks.compatible with windows 7, xp, linux, mac OS) 2.excellent quality Cheap Magnetic card ... BPI 210 BPI Capacity 79 characters(7 bit code)40 characters(5 bit code)107 characters(5 bit code)Power Power supplied by the ...