Biometric Fingerprint Door Lock 98AT - Satin Nickel - Left-handed Three way to unlock: Fingerprint, Pin and Key. Fits a USA standard 2-1/8" diameter hole with a thickness of 1 3/8"-2 1/4" Easily add or delete individual users directly on the lock (No PC required) Optional Audit Trail Kit available upon request, price is $149. Weatherproof, good for out door use.