CU-SD Single Door Controller employs state-of-the-art technology, building along with latest card data storage algorithm and real-time clock technology, greatly improves clock accuracy and enlarges the system storage capacity. And thanks to the contemporary design, it offers better anti-interference capabilities and enhances system stability. CU-SD supports Integrated proprietary reader with LCD display. The system expansibility of CU-SD allows up to 127 controllers can be added in the system network. Newly incorporated features such as anti-passback function and network operation capability makes this versatile CU-SD suitable for intelligent access control and attendance system.