MILLIONHOME 752811749974
MILLIONHOME Fingerprint Smart Door Lock
Model: 752811749974 - Instruction Manual
Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your MILLIONHOME Fingerprint Smart Door Lock. Please read this manual thoroughly before installation and use to ensure proper function and to maximize the lifespan of your device. This smart door lock offers multiple unlocking methods including fingerprint, passcode, mobile app, and traditional physical keys, enhancing security and convenience for your home, office, or apartment.

Image: The MILLIONHOME Fingerprint Smart Door Lock, showcasing its sleek design and the accompanying mobile application interface.
Safety Information
- Do not attempt to disassemble or repair the lock yourself. Contact customer service for assistance.
- Use only specified battery types (4 AAA batteries). Do not mix old and new batteries or different types of batteries.
- Keep physical keys in a secure location outside the property to be used as a backup in case of emergency or battery depletion.
- Avoid exposing the lock to direct water spray or corrosive substances.
- Ensure all components are securely fastened during installation to prevent malfunction.
Package Contents
Please verify that all the following components are included in your package:
- Front Handle Assembly (with fingerprint sensor and keypad)
- Rear Handle Assembly
- Latch Mechanism
- Strike Plate
- Mounting Screws and Hardware
- Physical Keys (2 included)
- Installation Template
- User Manual
Specifications
| Feature | Description |
|---|---|
| Brand | MILLIONHOME |
| Model Name | 752811749974 |
| Lock Type | Biometric (Fingerprint) |
| Material | Zinc Alloy |
| Color | Black |
| Dimensions (L x W x H) | 6.3 x 2.55 x 2.55 inches |
| Item Weight | 16 ounces (1 pound) |
| Power Source | 4 x AAA Alkaline Batteries (not included) |
| Connectivity | Bluetooth (for App control, Wi-Fi with optional gateway) |
| Controller Type | Android, iOS App |
| Door Thickness Compatibility | 1-3/8'' to 2-1/8'' (35mm - 55mm) |
| Backset Compatibility | 2-3/8'' (60mm) and 2-1/8'' (70mm) |
| Fingerprint Recognition Rate | Up to 98% |
| Unlock Speed | Approximately 1 second |
Setup and Installation
The MILLIONHOME Smart Door Lock is designed for easy installation without complex wiring or drilling. It is compatible with standard US doors and can be installed on both left-handed and right-handed doors.
1. Door Compatibility Check
- Ensure your door thickness is between 1-3/8'' (35mm) and 2-1/8'' (55mm).
- Verify your door's backset (distance from door edge to center of bore hole) is either 2-3/8'' (60mm) or 2-1/8'' (70mm). The latch is adjustable to fit both.
2. Physical Installation Steps
- Prepare the Door: If replacing an existing lock, remove it. Use the provided template to mark and drill holes if installing on a new door.
- Install the Latch: Insert the latch mechanism into the door edge. Ensure the bevel of the latch bolt faces the door frame. Adjust the backset if necessary. Secure with screws.
- Install the Exterior Handle: Insert the spindle and data cable from the exterior handle assembly through the latch and door hole.
- Install the Interior Handle: Connect the data cable from the exterior handle to the interior handle assembly. Align the interior handle with the mounting posts and secure it to the exterior handle using the provided screws.
- Install Batteries: Open the battery cover on the interior handle. Insert 4 AAA alkaline batteries, ensuring correct polarity. Close the battery cover.
- Test Functionality: After installation, test the mechanical operation of the handle and latch.

Image: A visual guide illustrating the components and simple installation process of the MILLIONHOME Smart Door Lock.

Image: The lock automatically adjusts for left or right-handed door configurations, simplifying installation.
Operating Instructions
Your MILLIONHOME Smart Door Lock offers multiple convenient ways to unlock your door.
1. Fingerprint Unlock
The lock features a high-speed fingerprint sensor with up to 98% recognition rate, allowing access in approximately 1 second. Up to 50 unique fingerprints can be stored.
- Enrollment: Refer to the mobile app instructions for adding new fingerprints. Typically, you will place your finger on the sensor multiple times from different angles until successfully registered.
- Unlocking: Place your registered finger on the fingerprint sensor. The lock will unlock if the fingerprint is recognized.

Image: A close-up view of the fingerprint sensor, highlighting its quick and accurate recognition capabilities.

Image: The fingerprint unlock feature supports up to 100 different fingerprints for multiple users.
2. Passcode Unlock
Enter your programmed passcode on the keypad. The lock supports an anti-peep function to protect your code from onlookers.
- Setting Passcodes: Use the mobile app to set and manage passcodes. You can create permanent, temporary, or one-time codes.
- Anti-Peep Function: To use, enter any random digits before or after your actual passcode. For example, if your code is 123456, you can enter 789123456012 and the lock will still open.

Image: The anti-peep password feature allows users to enter random digits before or after their actual code for enhanced privacy.

Image: A visual explanation of how to use the anti-peeping password feature by adding random numbers around the correct code.
3. Mobile App Unlock
Control your door lock remotely using the dedicated mobile application (compatible with iOS and Android devices). For internet-based remote control, an optional MILLIONHOME Tuya Bluetooth gateway is required.
- Download App: Search for the recommended app (e.g., Tuya Smart App) in your device's app store.
- Pairing: Follow the in-app instructions to pair your smartphone with the door lock via Bluetooth.
- Functions: Unlock/lock the door, manage fingerprints and passcodes, view access logs, and set temporary access for guests or service providers.

Image: The mobile application interface demonstrating how to unlock the smart door lock using a smartphone.

Image: The Smart APP Unlock feature, showing how the lock connects to a smartphone and optionally to the internet via a Tuya Bluetooth gateway.
4. Key Unlock (Emergency Backup)
In situations where electronic access is unavailable (e.g., dead batteries, system malfunction), you can use the provided physical keys.
- Insert the physical key into the keyhole located at the bottom of the exterior handle.
- Turn the key to unlock the door.

Image: A physical key being inserted into the emergency keyhole to unlock the smart door lock.

Image: The Keys Unlock feature, illustrating the use of physical keys as a reliable backup access method.
5. Emergency Charging
If the batteries are completely depleted, the lock is equipped with a Type-C interface for emergency power supply.
- Connect a portable power bank (not included) to the Type-C port on the exterior handle.
- Once temporary power is supplied, you can use your fingerprint or passcode to unlock the door.
- Replace the internal AAA batteries as soon as possible after gaining access.

Image: Features including low battery alert, emergency power supply via a Type-C port, and a backlit keypad for visibility in low light.
Maintenance
- Battery Replacement: The lock has a low battery reminder function. Replace all 4 AAA batteries promptly when indicated to avoid being locked out.
- Cleaning: Wipe the lock's surface with a soft, dry cloth. Avoid abrasive cleaners or solvents that could damage the finish or electronic components.
- Fingerprint Sensor: Keep the fingerprint sensor clean and dry for optimal performance.
- Software Updates: Regularly check the mobile app for any available firmware updates for your lock to ensure the best performance and security features.
Troubleshooting
- Lock Not Responding: Check battery levels. If batteries are low or dead, use the emergency charging port or physical key.
- Fingerprint Not Recognized: Ensure your finger is clean and dry. Try re-registering your fingerprint in the app. Ensure your finger covers the sensor completely.
- Passcode Not Working: Verify the passcode entered is correct. Ensure the lock is not in a temporary lockout mode. Try using the anti-peep function.
- App Connectivity Issues: Ensure Bluetooth is enabled on your smartphone and you are within range of the lock. Restart the app or your phone. If using a gateway, ensure it is powered on and connected to Wi-Fi.
- Lock Mechanism Jammed: Check for any obstructions in the door frame or latch bolt. Ensure the lock is installed correctly and not misaligned.
- Inconsistent Locking/Unlocking: This could indicate low batteries or a need to recalibrate the lock. Check the app for calibration options or replace batteries.
Warranty and Support
MILLIONHOME provides customer support for its products. If you encounter any installation issues, missing parts, or require technical assistance, please contact our customer service team.
- Customer Service: A 24-hour customer e-mail service is available from the date of purchase.
- Contact: Refer to the contact information provided with your product packaging or on the official MILLIONHOME website for the most up-to-date support channels.
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