Magnetic Card can be written into for memory, change information written, highly reliable, large data capacity, low error rate, with high speed in information read and write. 1.1, magnetic card types Low resistant magnetic card common coercive force: 300 OE High resistant magnetic card common coercive force: 2750 OE Full magnetic card common coercive force: 2750 OE 1.2, magnetic bars and magntic channels Magnetic bar has 3 magnetic channels. Each magnetic channel can record number(0-9), letters (a-z)and other codes, the maximum number is 79 numbers or letters. Magnetic channel 2 and 3 are for memory of number (0-9). Magnetic channel 2 maximum capacity is 40 characters, magnetic channel 3 maximum capacity is 107 characters.