Zuosheng Smart Door Lock with Handle – Keyless Entry Deadbolt with Fingerprint, Touchscreen Keypad, Tuya App Control, Passcode & Key, Doorbell, Auto Lock Electronic Front Door Lock for Home Security, Black Smart Door Lock

6-in-1 multi unlock modes: fingerprint, mobile APP, anti-peep PIN code, IC card, mechanical backup key for flexible access control Integrated smart doorbell + anti-tamper alarm & wrong-code lockout function to strengthen household security Intelligent auto-lock function automatically locks the door after closing to avoid forgetting to lock up Standard heavy-duty 6068 mortise lock cylinder, sturdier and smoother than ordinary single-cylinder locks with higher anti-theft performance Premium matte black aluminum alloy housing, anti-fingerprint and scratch-resistant, elegant high-end appearance Tuya smart APP remote management: remote unlock, temporary/permanent password setup, real-time access records, personalized parameter adjustment anytime anywhere Multi-user permission management: store multiple user credentials, generate one-time guest passwords, ideal for families and short-term rental hosts DIY quick installation, compatible with 45–90mm thick doors, equipped with detailed English manual, no professional installers needed Powered by 4 AA batteries with low-battery reminder; reserved external emergency power supply interface to prevent lockout due to dead batteries