missing keys -----------------------HEIXSMT Fingerprint Door Lock, Biometric Lock with Keypad, Silver, Suitable for Home, Apartment, Office, Bedroom

Additional Details from the Manufacturer

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More features

• Multiple Accesses: 3 in 1 biometric door lock that meets daily life. Code unlock 4*Key Fobs and fingerprint unlock - you don't need to carry keys with you or worry about looking for keys everywhere. Mechanical key can be used as a backup key to unlock (in case of emergency such as battery exhaustion)
• Fingerprint sensor: 508 DPI fingerprint sensor module, 360° fingerprint reading is accurate and fast, supports storage of up to 100 sets of fingerprints, and the recognition rate exceeds 99% within 0.3 seconds.
• Easy Installation: Keyless entry door lock is designed to fit US standard door, Backset 2-3/8″(60mm) and 2-1/8″(70mm), door thicknesses from 1-3/8'' to 2-1/8''(30mm -55mm). the lock just with a small screwdriver quickly and easily install. Fit both left handed and right handed doors(Suitable for indoor and outdoor doors).
• Warm Tips: Fingerprint door knob requires 4 AAA batteries (not included), which can be used for up to 8-10 months depending on the frequency of use. Low battery reminder function (the red light will flash three times when unlocking); equipped with a USB interface, which can be used for backup power.
• After-Sales: Provide customer service that responds within 24 hours, if you have any questions about our door locks, please feel free to contact us and provide 365 days after-sales service support.