Zhongshan Lanzhong Intelligent Technology Co., Ltd. has 4 own brands including sin&mi, Zhiejia, Shangmi, and Haiweide. It is a composite enterprise integrating smart lock research and development, manufacturing and sales. The company has always focused on the fully automatic smart lock market, with the development model of "continuous, stable, professional and focused", and strives to become the leader in high-security fully automatic smart locks.