Handheld biometric devices come equipped with internal memory to store user data and logs. In the absence of a network, they function in offline mode and sync later when connected. This offline capability ensures attendance is never missed, even in rural or no-network zones. The system maintains data integrity by ensuring each log is time-stamped and securely encrypted. https://mobiworkforce.com.sg/products/handheld-biometric-fingerprint-attendance/