Adjustable Smart Cylinder Door Lock A versatile, easy to install smart cylinder lock that fits most interior and exterior doors without drilling wiring or carpentry. Designed for renters and homeowners who need secure keyless entry and flexible access control. Key benefits Easy installation and maintenance: Adjustable cylinder and surface mounting mean fast setup without modifying the door. No drilling no wiring and no carpentry work required. Multiple secure access methods: Support for app control fingerprint RFID card digital passwords and mechanical keys gives convenient options for every user and situation. Flexible access control: Create onetime periodic or permanent access codes via the app share temporary access remotely and review entry logs for visibility and control. Robust operation and low maintenance: Runs on three AAA 1.5V alkaline batteries with a 3.6V to 4.8V input range and low battery reminder. Automatic lock and passage mode add convenience. Main specifications Colors available: Silver or Black Materials: 304 stainless steel aluminum zinc alloy and plastic Adjustable cylinder length: 35 to 60 mm Fit door thickness: supports 38 to 120 mm overall door thickness External and internal thickness guidance: external side 20 to 45 mm internal side 20 to 70 mm Power supply: 3 AAA 1.5V alkaline batteries Power input range: 3.6V to 4.8V Working temperature range: minus 55 to 60 degrees Celsius Waterproof rating: indoor lock not waterproof Handle direction: reversible Automatic lock: yes Passage mode: yes Protection features: antipick and antidrill cylinder design and prevent black box function Compatibility: supports gateway for remote control and is compatible with Tuya Smart Life and other smart home platforms Unlock methods: app control fingerprint RFID card password mechanical key Password types supported: onetime periodic and permanent code versions App and smart features Remote lock and unlock using the app Share temporary access codes and set schedule based passwords Monitor entry logs and receive low battery alerts Gateway support for extended remote functions and integration with smart home systems Installation and compatibility notes Adjustable cylinder length and reversible handle accommodate most steel wooden and stainless steel doors Confirm door panel thickness against the external and internal thickness guidance before ordering Intended for indoor and sheltered door installations due to non waterproof design Practical use scenarios Apartment rental: Grant short term entry codes to guests cleaners or maintenance staff and revoke access when needed without changing locks. Family home: Family members can use fingerprint or card access while caregivers or visitors receive scheduled codes through the app. Small office or shared workspace: Use app based logs and periodic passwords for contractors and service personnel while maintaining a mechanical key backup. What to check before Measure external and internal door thickness to ensure compatibility with the adjustable cylinder ranges provided Confirm intended installation is sheltered indoor or protected from direct weather exposure due to non waterproof classification This lock delivers flexible access control and straightforward installation while supporting multiple secure unlocking methods and smart home integration.