The K6 smart door lock series including three models for different user segments, with a consistent and home-based design language. With a face recognition camera and natural wooden texture handle, K6-X was carefully designed for families to attend kids and elderly needs, meeting the requirement of reliability, friendly and easy-using. The K6-C has a more concise looking and simpler user experience. It has a fingerprint module under the screen, meeting the needs of those who require fast security and concealment operations. For a welcomed traditional way of use, K6-D uses the conventional down pressure door handle. The Design also optimizes supply chain resource allocation with the sharing of 80% of the components.