The barcodes are placed on the lower left edge of the permits. They are similar to the "magnetized strips" found on the time cards of government and company employees, but are read by a light pencil instead of a clock-in machine.
此種條碼加制在入出境證的左下端，與一般公務人員及公司行號員工上下班刷卡「磁帶」相似，所不同的前者是用「刷卡機」，而後者則是一種「光筆」，輕輕一劃，發出聲音後個人資料號碼即已輸入。