The barcode attendance machine uses photoelectric reading of barcode card numbers, resulting in a low failure rate. Disadvantages: Cards are prone to forgery (except for specialized stock masking barcodes), and the sensitivity decreases and there are errors when the barcodes become dirty.

Attendance machines have the advantages of improving management efficiency, avoiding human factors, diverse attendance methods, and data analysis and report generation, making them one of the important tools for modern enterprise management.