Introduction
This manual provides comprehensive instructions for the installation, setup, operation, and maintenance of your IRONZON Fingerprint Biometric Door Lock. Please read this manual thoroughly before installation and use to ensure proper function and longevity of the product.
Key features include:
- Multiple Unlock Methods: Fingerprint, Passcode, and Physical Key.
- Voice Navigation: Bilingual support (Chinese, English, Spanish) for guided setup and operation.
- Emergency Charging: Type-C port for temporary power in case of battery depletion.
- Easy Installation: Designed for US standard doors, compatible with various backsets and door thicknesses.
Package Contents
Please verify that all components are present before beginning installation.
- Front Handle Assembly (with keypad and fingerprint sensor)
- Rear Handle Assembly
- Latch Mechanism
- Strike Plate
- Mounting Screws
- Physical Keys (2)
- Installation Template (may be included)
- User Manual (this document)

Image: The IRONZON Fingerprint Door Lock, displaying the front handle with keypad and fingerprint sensor, the rear handle, and the included physical keys.
Product Overview
Familiarize yourself with the different parts of the lock.

Image: A detailed view of the lock's front handle, indicating the fingerprint sensor area, the numerical keypad, and the emergency keyhole.

Image: An overview of the IRONZON 191F Fingerprint door lock, showcasing its design in both black and silver finishes.
Installation Instructions
Compatibility Check
This lock is designed for US standard doors. Please ensure your door meets the following specifications:
- Backset: 2-3/8 inches (60mm) or 2-1/8 inches (70mm)
- Door Thickness: 1-3/8 inches (35mm) to 2-1/8 inches (55mm)
- Suitable for both left-handed and right-handed doors.

Image: A visual guide illustrating the required door thickness (1-3/8" to 2-1/8") and adjustable backset (2-3/8" or 2-1/8") for proper installation.
Step-by-Step Installation
- Prepare the Door: Ensure the door is properly drilled according to the provided template (if applicable).
- Install the Latch: Insert the latch mechanism into the door edge. Ensure the latch bolt faces the correct direction for your door swing.
- Install the Front Handle: Position the front handle assembly on the exterior side of the door, aligning the spindle with the latch mechanism.
- Install the Rear Handle: Place the rear handle assembly on the interior side, connecting it to the front handle and latch. Secure with mounting screws.
- Insert Batteries: Open the battery cover on the rear handle and insert 4 AAA batteries (not included), observing polarity.
- Test Functionality: After installation, test the mechanical operation of the handle and latch before proceeding to electronic setup.

Image: This diagram illustrates how the door lock can be configured for both left-handed and right-handed door installations.
Setup and Programming
The lock features voice navigation to guide you through the setup process. The default language is English.

Image: The lock's voice guidance system in action, displaying prompts for user interaction during setup, such as pressing a finger or entering administrator details.
1. Initial Administrator Setup
- Press the 'SET' button (usually located on the interior handle).
- Follow the voice prompts to register the first administrator fingerprint or passcode. This will be the primary user for managing other users.
- Register your fingerprint multiple times from different angles for better recognition.
2. Adding User Fingerprints
- Access the administration menu using the administrator fingerprint or passcode.
- Select the option to 'Add User'.
- Follow the voice prompts to register new user fingerprints. Up to 50 fingerprint groups can be stored.
3. Adding User Passcodes
- Access the administration menu.
- Select the option to 'Add Passcode'.
- Enter a desired passcode (e.g., 6-8 digits) and confirm it.
4. Changing Language
The lock supports Chinese, English, and Spanish. Refer to the voice prompt menu for language selection.
Operating Instructions
Unlocking the Door

Image: This image illustrates the three primary methods for unlocking the door: using a registered fingerprint, entering a numerical passcode on the keypad, or utilizing a traditional physical key.
- Fingerprint Unlock: Place a registered finger on the fingerprint sensor. The lock will unlock if the fingerprint is recognized.
- Passcode Unlock: Enter your registered passcode on the keypad, followed by the '#' key. The lock will unlock if the passcode is correct.
- Physical Key Unlock: Insert the physical key into the keyhole and turn to unlock the door. This method is primarily for emergency access.

Image: A visual representation of the various access methods supported by the lock, including keyless entry, passcode, fingerprint, auto-lock timers, and physical key.

Image: Close-up illustrations demonstrating the actions for Passcode Unlock, Fingerprint Unlock, and Physical Key Unlock.
Locking the Door
The lock will automatically lock after a few seconds once the door is closed. No manual action is typically required for locking.
Maintenance
Battery Replacement
The lock is powered by 4 AAA batteries (not included). When the battery level is low, the lock will provide a low battery reminder via voice prompt or indicator light.
- Open the battery cover on the interior handle.
- Remove the old batteries.
- Insert 4 new AAA batteries, ensuring correct polarity.
- Close the battery cover.
Emergency Power
In case of complete battery depletion, the lock can be temporarily powered using a Type-C cable connected to an external power bank. This port is for emergency power only and does not charge the internal batteries.

Image: This image demonstrates the emergency unlocking method, showing a Type-C cable connected to the lock for temporary power when the internal batteries are low or depleted.
Cleaning
Wipe the lock surface with a soft, dry cloth. Avoid using abrasive cleaners or solvents that may damage the finish or electronic components.
Troubleshooting
- Lock not responding: Check battery level. Use emergency power via Type-C port if batteries are dead.
- Fingerprint not recognized: Ensure your finger is clean and dry. Try different angles. Re-register fingerprint if issues persist.
- Keypad not responding: Ensure batteries are not depleted.
- Voice prompts are unclear or in wrong language: Refer to the setup section for language change instructions.
- Lock does not engage: Check for any obstructions in the door frame or latch mechanism. Ensure the latch is installed correctly.
Specifications
| Feature | Specification |
|---|---|
| Brand | IRONZON |
| Model Name | LOC191FBUSIR |
| Lock Type | Biometric, Keypad |
| Special Feature | Fingerprint Recognition, Voice Navigation, Emergency Type-C Power |
| Power Source | 4 x AAA Batteries (not included) |
| Door Thickness Compatibility | 1-3/8" to 2-1/8" (35mm-55mm) |
| Backset Compatibility | 2-3/8" (60mm) and 2-1/8" (70mm) |
| Fingerprint Capacity | Up to 50 groups |
| Dimensions (L x W x H) | 6.3 x 2.3 x 2.3 inches |
| Item Weight | 1.87 pounds (0.85 kg) |
Warranty and Support
For warranty information or technical support, please refer to the contact details provided with your purchase or visit the official IRONZON website. Keep your purchase receipt for warranty claims.



