Smart Door Lock with Builtin Doorbell, Peephole and Display Key benefits Consolidates three functions into one unit: integrated doorbell, peephole camera, and indoor display reduce the need for separate devices and simplify entry monitoring. Multiple convenient unlocking options let household members choose the method that suits them : mobile app, mechanical key, access card, numeric password, or fingerprint. Flexible installation and fit: reversible handle supports left or right opening doors and adapts to standard door thickness from 35 to 55 mm. Reliable daily use: mechanical key provides a trusted backup when electronic methods are unavailable. Main features Builtin doorbell: visitors trigger an audible alert and are visible on the indoor display for quick identification. Builtin peephole and display: view live visitor images at the door from inside without opening the door. Five unlocking methods: APP control for remote access, mechanical key for emergency override, card for fast entry, password for shared access without devices, and fingerprint for quick hands unlocking. Reversible handle: swap handle direction during installation to match left or right hinged doors without additional parts. Door thickness compatibility: designed for doors with thickness between 35 mm and 55 mm to fit most residential and light commercial doors. Practical advantages Simplifies visitor screening and entry management by combining visual verification and multiple access options in one unit. Provides redundancy and flexibility: if one unlocking method is unavailable, alternate methods ensure uninterrupted access. Streamlines installation and replacement: works with common door thicknesses and includes a reversible handle to minimize fit issues. Materials and performance notes Built to integrate with standard door hardware and mounting openings for straightforward installation. Designed for regular residential and small office use with durable components suitable for frequent operation. App connectivity enables remote control and management from a smartphone when needed. Use scenarios Apartment main entrance: Use fingerprint or card for daily access, allow delivery personnel to ring the builtin doorbell, and check visitors through the builtin peephole and indoor display before opening. Small office door: Grant employees access with cards or passwords, keep a mechanical key for emergency access, and monitor visitor arrivals via the display. Shortterm rental or shared housing: Provide temporary passwords or cards for guests, manage access remotely with the app, and use the peephole display to verify identity before granting entry. What to check before buying Confirm your door thickness is within the supported range of 35 mm to 55 mm. Verify the door swing direction so you can set the handle to the correct reversible orientation. Ensure you are comfortable using at least one of the supported unlocking methods: app, mechanical key, card, password, or fingerprint. This integrated smart lock offers a compact, flexible solution for controlling access and viewing visitors without adding separate devices, while supporting multiple backup options to match everyday needs.