Simple and intuitive, without the need for computer knowledge, the price is relatively low. Disadvantages: cumbersome statistics, monthly replacement of cards, high mechanical failure rate (card sockets are easily damaged). Applicable scope: Units with less than 100 people and good environment. Magnetic card attendance machines can use computers to collect attendance data. Disadvantage: Magnetic cards and heads are vulnerable (perhaps there are more reliable magnetic card devices). Scope of application: Places with good hygiene environment and high personnel quality (mostly used for access control, banks, etc.).