The smart biometric door lock RUILON U81 combines several modern access methods in a compact security system. Depending on the configuration, the door can be opened via fingerprint, numeric code, or RFID card, largely replacing the traditional key in everyday use. Biometric authentication via fingerprint enables quick and convenient access, while the numeric code offers a practical alternative for authorized users. Additional access permissions can be set up and flexibly managed via RFID cards. The RUILON U81 is suitable for a variety of applications, including apartments, offices, vacation rentals, and other spaces where controlled and convenient access is essential. The combination of multiple opening methods provides added flexibility for different users. The modern design combines user-friendly operation with a contemporary security concept. The ability to use different access methods simultaneously and adapt access to specific requirements is particularly practical. With its combination of biometrics, PIN code and RFID technology, the RUILON U81 offers a modern alternative to conventional door locks and is suitable for users who value convenience, flexible access options and a modern security solution.