HKM-2888531 3D Face Recognition Smart Door Lock with 4.5 Inch Screen, Camera, Fingerprint, PIN, Card, App and Key Entry

HKM-2888531 · Smart Locks · Specifications

3D Face Recognition Smart Door Lock

The HKM-2888531 is an aluminium-alloy smart door lock built around a 3D face sensor, a 1.2-megapixel camera with infrared night vision and a 4.5-inch colour screen on the indoor panel. Six ways open the door — 3D face, fingerprint, PIN code, IC card, the mobile app and a mechanical key — while a 5200 mAh battery, a Grade C cylinder and a 6068 stainless steel lock body sit behind the panels. It ships in Black or Gold, both with the same hardware inside.

Think about the moment your hands are full: bags in one hand, a child in the other, no free finger for a keypad. The face sensor reads a standing person from about 100 cm to 200 cm of height and the door unlocks in roughly half a second, at night, in glasses, under a hat. When nobody is home the same camera answers a doorbell press and pushes the picture to the phone, where the visitor can be seen, spoken to and let in. That is the working range the HKM-2888531 covers.

At a Glance

• 3D face recognition with infrared fill light, works in low light and at night
• 4.5-inch colour screen on the indoor panel for real-time visitor view
• Six entry modes: 3D face, fingerprint, PIN code, IC card, app, mechanical key
• 5200 mAh battery, Grade C cylinder and 6068 stainless steel mortise
• App control for remote unlock, temporary passwords and unlock history
• Two finishes in the range: Black and Gold, identical configuration across both

Materials and Construction

The outdoor panel is a single aluminium-alloy plate with an electroplated finish, tested for 120 hours of salt spray so the surface resists oxidation and keeps its colour under daily handling. A 3D face module sits at the top of the panel behind a dark window, with three infrared emitters and a camera lens grouped above a circular fingerprint ring. Below the ring sits a twelve-key backlit keypad with a card reader zone, and at the bottom a covered mechanical key cylinder that only shows itself when the cover is lifted.

The indoor panel carries the 4.5-inch colour screen at the top, a row of three control buttons directly beneath it, a battery compartment behind a magnetic cover in the middle, and two thumb-turn knobs at the bottom — the upper knob throws the deadbolt, the lower one releases the latch. Both panels share the same aluminium-alloy base material, and the two colourways differ only in plating, not in hardware.

Behind the panels sits a 6068 stainless steel mortise, the standard body format used across entry doors, with a Grade C lock cylinder. The cylinder grade refers to the resistance class of the mechanical core: it is the part that a physical attack would target, and it is deliberately separated from the electronic layer so that a lost battery never means a lost door.

How It Works

Face recognition runs on a structured-light 3D module rather than a flat camera. The module projects an infrared pattern, measures depth across the face and compares the result with the stored template, which is why a photograph held up to the lens does not pass. Recognition is quoted at roughly 0.5 seconds and an error rate of 0.001% by the module supplier, and the sensor covers a standing height band of 100 cm to 200 cm, so children and tall adults both fall inside the frame without crouching or stretching. Infrared fill light keeps the same performance at night and in a dim hallway.

The fingerprint reader is a semiconductor sensor with a 160 × 160 sensing area, positioned as a ring around the button so that a thumb lands on it naturally when the hand grips the handle. PIN entry accepts 6 to 20 digits and supports a virtual or dummy password: a longer string can be typed around the real code, and the door still opens as long as the true digits appear in order somewhere inside it. That defeats a shoulder-surfer reading the keypad from a distance.

IC cards are encrypted, so a copied card number alone will not open the lock. The mechanical key is the offline path and works with the electronics completely dead. The app layer adds remote unlock, temporary passwords with a time window for guests or cleaners, an unlock history with timestamps, and live indoor monitoring from the camera. Auto-locking can be switched on so the deadbolt throws itself once the door closes, and the camera can be set to capture a still each time someone stands at the door.

One detail worth knowing: the lock is built to resist the electromagnetic attack sometimes called a black-box test, where a coil is held against the panel to force a release. The housing and circuit layout are shielded against it, which is why the product is described as explosion-proof in supplier material.

Placement and Use

The HKM-2888531 fits wood, steel, stainless steel, aluminium and brass entry doors — the five door materials that cover almost every home, apartment and small office door. Because the body is a 6068 format, it drops into doors already cut for that mortise pattern, which keeps installation to a swap rather than a rebuild. The outdoor panel faces the weather and the indoor panel faces the room, and the two are linked only by the body inside the door.

Typical settings are a main entrance, a rental unit where the tenant changes and the temporary password is reset instead of the lock, a home office that needs an unlock trail, and a second door where family members come and go with their hands full. In a rental the app matters as much as the hardware: a new temporary code can be issued from another city without anyone travelling to the door.

Inside the house the indoor screen doubles as a viewer. A doorbell press wakes the panel, the visitor appears on the 4.5-inch display, and the three buttons under the screen handle answer, hang up and playback. Nobody has to reach for a phone to see who is outside.

Included and Optional

The two panels are matched as a pair — the outdoor unit carries the camera and the reader, the indoor unit carries the screen and the battery, and both must be installed for the video and face functions to work. Cards and keys are consumables in daily use, so keeping a spare card in a drawer and a key outside the house is worth planning at installation.

Colours and Finishes

Two finishes are offered. Black is a deep graphite plating that reads almost matte in daylight and blends into a dark door; Gold is a warm champagne tone that stands out against white and wood-grain doors. Both use the same electroplated process and the same 120-hour salt spray standard, so the choice is purely visual — the panels, sensor layout and lock body are identical between them.

On a black steel door the Black version all but disappears, which suits a minimal entrance. On a light oak or white door the Gold version gives the hardware a deliberate presence. Because the finish is plated rather than painted, cleaning with a dry or slightly damp cloth is enough; abrasive pads and solvent sprays are what dull a plated surface over time.

Care and Maintenance

Wipe the panels with a dry microfibre cloth. For fingerprints on the keypad or the screen, a cloth barely dampened with water is enough — alcohol, acetone and household glass cleaners can cloud the plated surface and the screen coating. Keep the fingerprint ring dry; a wet thumb reads poorly and leaves residue in the sensing area.

Clean the camera window and the infrared emitters at the top of the outdoor panel the same way. Dust on that window is the usual cause of slow face recognition, and it is a two-second fix. Check the battery level in the app rather than waiting for the low-battery warning, and keep the mechanical key somewhere outside the house — a key locked inside is the one failure mode a smart lock cannot solve for you.

Twice a year, open and close the door with the mechanical key to keep the cylinder free, and check that the mortise bolts move without resistance. If the door has swollen with the season and the bolt drags, adjust the strike plate rather than forcing the motor, since a binding bolt is what wears a motorised body out early.

Specifications

Frequently Asked Questions

Shipping, Returns and Warranty

HKM-2888531 — aluminium-alloy smart door lock with a 3D face module and infrared night vision, a 1.2-megapixel camera feeding a 4.5-inch indoor screen, six ways to open the door across face, fingerprint, PIN, IC card, app and key, a 5200 mAh battery, a Grade C cylinder and a 6068 stainless steel mortise, offered in Black and Gold. Read the manual before first use. Nothing here is safety certification advice.