fingerprint Fingerprint lock samples:  A. STYLE#: LF-21S Main feature: l Chrome plate, never wear and tear  l Streamline design, fashion style.  l With false key and spare power source without fear of disturbance in rear l Equipping with LFR3 optical fingerprint sensor structure  Performance index  l Power supply: 4 ?.5V l Power peak value: 1W, 0.5W average l Dormancy current: 1uA l Temperature: -10℃~75℃ (external); 0℃~60℃(Internal) （inside） l