Fingerprint Door Lock, Ardwolf A1 Keyless Biometric Keypad Lock with Reversible Lever and Automatic Locking, No Drills Needed - Satin Nickel, Provide with USA Local Repair Service FIVE WAYS TO UNLOCK: fingerprint, user code, user code + fingerprint, fingerprint + fingerprint, mechanical keys. Double verification mode is increased lock security level significantly. REVERSIBLE HANDLE: This lock fits either left or right handed door; Reversing lever controlled by key; Removable key cylinder lets the user make key copy or re-key without bringing the whole lock. LARGE CAPACITY: Up to 100 fingerprints and 100 user codes could be added to the lock system. Could add or delete individual users directly at the keypad without the use of a computer. PURCHASE NOTES: Only designed for INTERIOR door; Fit dimension 2-1/8" hole, no need to drill extra hole; Fit door thickness between 1-3/8" and 2-3/8" QUALITY GUARANTEE: One year warranty and US local repair service. If you have any question when you install or using this door lock, please feel free to contact us any time.