0.001% False rejection rate. 0.0001% False Acception rate. Up to 120 fingerprint users. Equipped with safety rope. Equipped with 2 spare keys. Ultra-low power consumption, 4 AA alkaline batteries with a service life of up to 12 months. Material : 1mm Cold rolled steel plate. Power Requirement : 4 AA Alkaline Batteries (Included). Battery life: 12-16 months. Unlocking method: Metal key & fingerprint. Fingerprint sensor: Optical fingerprint sensor. Exterior dimension: 275x190x500mm (10.8×7.5×2.0). Interior dimension: 200x185x40mm (7.9×7.3×1.8). Device weight: 1920g(4.22lbs). Working voltage 4.8-6.5v.