[Newest Upgrade]Secustone Fingerprint Door Lock, Keyless Entry Door Lock , Smart Door Lock with Passcode, Fingerprint, and Keys, Door Lock Fingerprint for Bedroom, Apartment, Office, Black, ??【FINGERPRINT HEAD BIGGER UNLOCK FASTER】：Fingerprint head version of fingerprint door lock is upgraded from 112 mm*96mm pixel to 160mm*160mm pixel. The recognition range is larger and the response is more agile., ??【THREE UNLOCK MODES】：Fingerprint door lock support three unlock modes: fingerprints(100 fingerprint users), passcodes(50 groups of passcodes) and mechanical keys(2 pcs)., ??【LOW BATTERY REMINDER】：Keyless entry door lock adds a battery indicator. When the battery power is too low, the indicator will light up and flash in red., ??【SILENT MODE】：Fingerprint door lock for bedroom can manually set the silent mode, so that you can go in and out of the room at night to avoid disturbing your family., ??【EXTERIOR BACKUP POWER】：Smart door lock has an external backup power interface, when you forget replaced the battery, you can use emergency USB for power supply and unlock.（This interface is only used for emergency power supply and cannot be charged）, ,