The Bioteknix K21 Pro operates on biometric identification principles, using fingerprint recognition for accurate time and attendance management. The core theory involves capturing the unique ridge patterns of a user's fingerprint through an optical sensor and converting them into digital templates. These templates are securely stored and later matched during attendance punches or access verification. The system supports multi-modal authentication—fingerprint, RFID card, or password—enhancing flexibility and security. Data communication occurs via TCP/IP or USB, allowing integration with attendance software for real-time monitoring and payroll processing. Additional features like SSR (Self-Service Recorder), auto push data, scheduled bells, and T9 input make it suitable for standalone and networked environments. Its onboard memory handles large log storage and user data even during offline mode. The Bioteknix K21 Pro is designed for organizations seeking accurate, tamper-proof, and automated attendance solutions.