The ZKTeco C3-400 Package B is an IP-based door access control solution designed for multi-door management. This complete package includes the C3-400 controller housed in a secure metal enclosure with keys, providing a ready-to-install and reliable system. Supporting up to 30,000 card users and 100,000 event records, the C3-400 Package B ensures continuous operation even during power outages or network interruptions, with all data safely preserved. With TCP/IP communication and compatibility with a wide range of card readers, it delivers advanced access control for offices, commercial buildings, and multi-door facilities.