Tapplock One is the world’s first smart fingerprint padlock. Using a state-of-the-art capacitive fingerprint sensor, it unlocks in 0.8 seconds and stores up to 500 fingerprints for multiple users. An adaptive algorithm means the lock becomes faster and more accurate the more you use it. It has a forged Zamak 3 zinc alloy metal body and a 7mm reinforced stainless steel shackle, strengthened by a double-layered design with anti-shim and anti-pry technologies.