How to punch in at the construction site to save labor costs?

How to check attendance at construction sites? Punching in can save labor costs. At present, the main methods of punching in the construction site are face brushing, fingerprint brushing and photo punching. Considering the cost saving, it will be more appropriate to take photos and punch in. Workers can directly install a fish bubble watermark camera on the mobile phone, and the daily attendance punching can be directly operated on the mobile phone for one or two minutes. The way of taking photos and punching cards is very simple, and workers generally do not encounter operational difficulties.