YOUR FINGER IS YOUR KEY: Unlock your door using the built-in advanced 3D fingerprint sensor. Unlike other smart locks, Lockly only uses high-quality capacitive fingerprint sensors which only recognizes fingerprints unlike less secure optical readers. Stores up to 99 unique fingerprints. | PEEK-PROOF DIGITAL KEYPAD: Patented PIN Genie technology makes it nearly impossible to guess your personal access code (even if someone is watching) when entering your PIN number by always shuffling number locations on the secure, backlit keypad. | SMARTPHONE CONVENIENCE: Lock and unlock your home, office, or rental property door all from the convenience of your iOS or Android smartphone via secure Bluetooth connection. Includes two backup physical keys for peace of mind. | KNOW WHO IS COMING AND GOING: Stores all access history so you can review who is coming and going anytime from your mobile phone. Great for keeping track of family members as they arrive home. Grant one-time use or specific time duration access by issuing codes or digital eKeys remotely via your mobile phone. Guests can access using their mobile phone, even without an internet or cellular connection. | EASY DIY INSTALLATION: Replaces existing deadbolt with basic household tools in about 15 minutes. Fits both left and right swinging standard doors, 1 3/8 to 2 inches thick. Requires 2 1/8 inch face bore hole.