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Courtesy of the door / Courtesy of the door

Courtesy of the door
Courtesy of the door

When you come to the office door , found the door is closed, if you knock on the door and that should not be disturbed? If at inproper time can disturb the boss, will not affect future career? The Courtesy Lock will be good to help you solve this problem. When someone in the house, the door handle in the horizontal position, then the green light signs and displays "Please come in" word, then you can safely knock on the door to enter. When the house of the people do not want to be disturbed, the door handle is rotated upward, the door will be locked, shows "Do not disturb", people outside will aware that this time should not come in.

University

Shandong University of Science and Technology

Shandong University of Science and Technology
Qingdao Shandong Province, China

wenqing li,
Shandong University of Science and Technology

linhao Yue,
Shandong University of Science and Technology