1. Product Overview
The UYF M4 Pro WiFi Smart Front Door Lock Set provides advanced keyless entry and smart home integration for enhanced security and convenience. This lock set features multiple unlocking methods, remote access capabilities, and robust construction for reliable performance.
Key Features:
- 12-in-1 Functionality: Keypad code, key fob, 360° biometric fingerprint, Bluetooth, WiFi (via included 2.4G gateway), IC card unlock, anti-peep passcode, auto-lock, one-touch lock, emergency charging, double-sided handles, and Alexa/Google Home voice control.
- Smart Home Integration: Manage access, set codes, and receive alerts via the app. Compatible with Alexa and Google Home.
- Durable Construction: Made from high-quality aluminum alloy with IP65 waterproof rating, designed for various weather conditions.
- Easy Installation: Designed for quick setup in under 15 minutes with basic tools.
Included Components:
- Smart Lock Assembly (Exterior and Interior Units)
- Handle Sets (Exterior and Interior)
- WiFi Gateway
- Mounting Hardware
- User Manual (this document)
- Keys (3 included)
- IC Cards (2 included)

Image 1.1: Overview of the UYF M4 Pro Smart Lock Set components, including the exterior keypad, interior unit, handle, WiFi gateway, and key fobs.

Image 1.2: Illustration showing the various unlocking methods available for the UYF M4 Pro Smart Lock, including WiFi, 360° fingerprint, Bluetooth, smartphone app, passcode, and traditional key.
2. Setup and Installation
The UYF M4 Pro Smart Lock is designed for straightforward installation. Please follow these general steps. A detailed installation guide is included in the product packaging and is recommended for specific instructions.
2.1 Compatibility Check
Before installation, ensure your door meets the following specifications:
- Door thickness: Typically 1.38 to 2.17 inches (35mm to 55mm).
- Backset: 2.36 or 2.75 inches (60mm or 70mm).
- Hole diameter: 2.13 inches (54mm) for the main bore, 1 inch (25mm) for the latch bore.
- Compatible with both left and right-handed doors.

Image 2.1: Diagram illustrating door compatibility requirements and dimensions for the UYF M4 Pro Smart Lock, including measurements for bore holes and backset.
2.2 Mechanical Installation
- Remove your existing lock and handle set.
- Install the latch and strike plate into the door frame.
- Install the exterior handle set and deadbolt mechanism.
- Install the interior mounting plate.
- Connect the cable from the exterior unit to the interior unit.
- Secure the interior unit to the mounting plate.
- Install batteries (4 AA batteries, not included).
- Test the mechanical operation of the handle and deadbolt.
Note: A screwdriver is the primary tool required for installation. No specialized tools are needed.
2.3 App and Gateway Setup
- Download the "Smart Life" or "Tuya Smart" app from your smartphone's app store.
- Create an account and log in.
- Add the smart lock to the app by following the in-app instructions. This typically involves pressing a button on the interior unit to put it into pairing mode.
- Plug in the included WiFi Gateway within 16 feet (5 meters) of the smart lock and your 2.4GHz WiFi router.
- Add the Gateway to the app, then link the smart lock to the Gateway for remote WiFi functionality.

Image 2.2: Depiction of the WiFi gateway connecting the smart lock to a home network, enabling remote access and control via a smartphone app.
3. Operating Instructions
The UYF M4 Pro Smart Lock offers multiple convenient ways to lock and unlock your door.
3.1 Unlocking Methods
- Fingerprint: Place your registered finger on the biometric sensor. The lock will unlock in approximately 0.3 seconds upon successful recognition.
- Passcode: Enter your 6-8 digit passcode on the touchscreen keypad, followed by the '#' key.
- Anti-Peep Passcode: To enhance security, you can enter random digits before and after your actual passcode. For example, if your passcode is 123456, you can enter 987123456012#. The lock will still recognize the correct sequence.
- IC Card: Tap a registered IC card against the designated area on the exterior unit.
- Key Fob: Use a registered key fob to unlock the door.
- Smartphone App: Use the "Smart Life" or "Tuya Smart" app to remotely unlock the door via Bluetooth (when nearby) or WiFi (when connected via gateway).
- Voice Control: Integrate with Amazon Alexa or Google Home. Use voice commands such as "Alexa, unlock my front door" (a voice PIN may be required for security).
- Physical Key: In case of power failure or electronic malfunction, use the provided physical key as a backup.

Image 3.1: Close-up of the UYF Smart Lock's fingerprint sensor, highlighting its 360° recognition capability and fast 0.3-second unlock time, powered by an AI chip.

Image 3.2: Demonstration of the anti-peep passcode feature, allowing users to enter random digits before and after the actual code to prevent unauthorized viewing.

Image 3.3: A user interacting with a smart speaker to control the UYF Smart Lock via voice commands, indicating compatibility with Amazon Alexa and Google Assistant.
3.2 Locking Methods
- Auto-Lock: The lock can be configured via the app to automatically lock after a set period (5-1800 seconds) once the door is closed.
- One-Touch Lock: Press and hold the '#' key on the keypad for 1 second to manually lock the door from the outside.
- Interior Handle: From the inside, simply lift the handle to lock the door.
- Smartphone App: Use the "Smart Life" or "Tuya Smart" app to remotely lock the door.

Image 3.4: Illustration of the auto-lock function, which can be set to engage after a specified time, and the one-touch locking feature using the '#' key.
3.3 User Management via App
The "Smart Life" or "Tuya Smart" app allows comprehensive management of your lock's access settings:
- Add/Remove Users: Register up to 200 fingerprints, 200 key fobs (IC cards), and 100 passcodes.
- Generate Codes: Create one-time, permanent, or scheduled passcodes for family, guests, or service providers.
- Activity Logs: View a real-time log of all lock and unlock events, including method and user.
- Battery Status: Monitor the lock's battery level and receive low battery alerts.
- Remote Control: Lock or unlock the door from anywhere with WiFi connectivity.

Image 3.5: Screenshot of the smartphone app interface demonstrating various control features, including access activity logs, user invitation, real-time messages, lock/unlock functions, battery monitoring, and code setting.

Image 3.6: Visual representation of how the UYF Smart Lock app allows users to grant and manage access for different individuals such as visitors, Airbnb guests, couriers, housekeepers, and repairmen.

Image 3.7: A person viewing real-time activity records on a smartphone, showing a log of door events and alerts from the UYF Smart Lock.
4. Maintenance
Proper maintenance ensures the longevity and optimal performance of your UYF M4 Pro Smart Lock.
4.1 Battery Replacement
- The lock requires 4 AA batteries (not included).
- When the battery level is low, the app will send an alert, and the lock may emit an audible warning.
- To replace batteries, remove the cover on the interior unit, replace the old batteries with new ones, ensuring correct polarity.
- In case of complete battery depletion, an emergency charging port (Micro-USB) is available on the exterior unit to temporarily power the lock for entry.
4.2 Cleaning
- Wipe the exterior and interior surfaces with a soft, damp cloth.
- Avoid using abrasive cleaners, solvents, or harsh chemicals, as these can damage the finish and electronic components.
- Keep the fingerprint sensor and keypad clean and free of debris for optimal performance.
4.3 Environmental Considerations
The UYF M4 Pro is designed to withstand various environmental conditions:
- Water Resistance: IP65 rated, providing protection against dust and low-pressure water jets.
- Temperature Range: Operates effectively in temperatures from -4°F to 158°F (-20°C to 70°C).

Image 4.1: Visual highlighting the robust construction of the UYF Smart Lock, made from aluminum alloy, with high anti-impact rating and deadbolt strength, and operational temperature range.
5. Troubleshooting
If you encounter issues with your UYF M4 Pro Smart Lock, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Lock does not respond to fingerprint/passcode. | Low battery, unregistered fingerprint/passcode, dirty sensor/keypad. | Replace batteries. Ensure fingerprint/passcode is correctly registered in the app. Clean the sensor/keypad. Try using the physical key. |
| App cannot connect to the lock. | Bluetooth/WiFi off, gateway out of range, network issues. | Ensure Bluetooth is enabled on your phone. Check if the WiFi gateway is powered on and within 16 feet of the lock and router. Verify your home WiFi network is active and 2.4GHz. Restart the app, lock, and gateway. |
| Lock is not locking/unlocking mechanically. | Misalignment, obstruction, mechanical issue. | Check for any obstructions in the door frame or latch. Ensure the lock is properly aligned. If the issue persists, contact customer support. |
| Keypad locks for 2 minutes. | Incorrect code entered 5 times. | This is a security feature. Wait for 2 minutes before attempting to enter a code again. Ensure you are using the correct passcode. |
| Voice control not working. | Incorrect setup with Alexa/Google Home, network issue, incorrect commands. | Verify the lock is correctly linked to your Alexa/Google Home account via the Smart Life app. Ensure your smart speaker has internet access. Use precise commands. |
For issues not covered here, please refer to the full user manual or contact UYF customer support.
6. Specifications
| Feature | Detail |
|---|---|
| Brand | UYF |
| Model Name | M4 Pro |
| Lock Type | Deadbolt |
| Special Features | Fingerprint, One-Touch Lock, With Gateway (WiFi), With Handle |
| Material | Aluminum Alloy |
| Color | Black |
| Item Dimensions (L x W x H) | 10 x 3 x 3 inches (25.4 x 7.62 x 7.62 cm) |
| Item Weight | 4.44 pounds (2.02 Kilograms) |
| Control Method | App, Remote, Touch, Voice |
| Connectivity Protocol | Bluetooth, Wi-Fi (2.4GHz) |
| Power Source | 4 AA Batteries (not included) |
| Waterproof Rating | IP65 |
| Operating Temperature | -4°F to 158°F (-20°C to 70°C) |
| Included Components | Smart Lock, Handle Sets, Gateway |
7. Warranty and Support
UYF stands behind the quality of its products. The UYF M4 Pro Smart Lock Set comes with the following:
- 60-Day Risk-Free Return Policy: For initial satisfaction.
- 1-Year Warranty: Covers manufacturing defects and malfunctions under normal use.
- Lifetime Customer Support: Assistance with installation, operation, and troubleshooting.
For warranty claims, technical assistance, or any questions regarding your UYF M4 Pro Smart Lock, please contact UYF customer support through the contact information provided in your product packaging or on the official UYF website.