Commercial/Residential: Fingerprint Care When registering a fingerprint, ensure your finger is clean and dry. Align the center of your fingerprint with the center of the sensor and hold it steady until you hear a "beep." If the sensor surface has oil or dust, gently wipe it with a soft, dry cloth to improve recognition accuracy. If your fingers are dry or cracked, lightly moisten them before attempting recognition., Daily Family Use Parents: Register fingerprints from your most frequently used fingers for the quickest daily unlocking method. It is recommended to register 1–2 fingers per person as a backup. Children under 12: Register fingerprints and update them every 3–6 months; as children's fingers change during growth, regular updates ensure smooth recognition. Seniors: It is recommended to register 2–3 fingers (e.g., thumb and index finger). ...