However, sometimes what we have printed are not exactlly what we need. We didn't think carefully before we print. Then they become waste...It is easy for us to press the print button when we decide to print document out. When we print at school except the free printer in 401 lab, the most thing we maybe care about is credit balance on our desktop. Each A4 paper costs us 0.05cent. When we print in the school library, we can not see our credit on the desktop, we will be reminded when our credit has been runned out. However, apart from reminding the credit, no reminder tip indicates us to save the paper to save the trees and environment. Think before we print, not just think about the credit but the trees as well.
The tip underneath tells us the document has been sent to the printer, it is in processing.
The credit label shows our credit balance, it is decreased each time we print. 
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