In 2065438+2008, the annual installation quantity of Knock Knock Smart Door Lock exceeded 65438+ 10,000 sets. Tsinghua University, Central Academy of Drama, Central South University, Nanjing University, Institute of International Relations, Shenzhen MSUBIT University, National University of Defense Technology, Wuhan University, Xiangtan University, Northwest University and other 985 colleges and universities chose the Knock-Knock intelligent door lock and management system.