Model: K02APRO | Brand: GHome Smart
Thank you for choosing the GHome 4 in 1 Smart Fingerprint Door Knob. This advanced door knob offers multiple secure access methods including fingerprint, keypad, mobile app control, and traditional mechanical keys. Designed for convenience and security, it is suitable for various indoor applications such as bedrooms, offices, and apartments. This manual provides comprehensive instructions for installation, setup, operation, and maintenance to ensure optimal performance and longevity of your smart door knob.
The GHome Smart Door Knob integrates multiple access technologies into a sleek design. The exterior knob features a fingerprint sensor and a numeric keypad, while the interior knob houses the battery compartment and manual override. The design ensures both security and ease of use for daily access.

Image: GHome 4 in 1 Smart Fingerprint Door Knob with keypad and keys.

Image: Diagram illustrating the four unlock methods: fingerprint, password, app, and mechanical key.

Image: A hand holding a smartphone displaying the GHome Smart app interface next to the smart door knob.
Before beginning installation, ensure your door meets the following specifications:

Image: Diagram showing door hole diameter, door thickness, and backset measurements for compatibility.

Image: Exploded view of the smart door knob components and their assembly on a door.
The smart lock is controlled via the Smart Life or Tuya App. Download the app from your device's app store.
Video: K02APRO APP Connection Guideline. This video provides a step-by-step guide on how to connect the GHome Smart Door Knob to the mobile application, covering initial pairing and basic app functionalities.
You can store up to 18 fingerprints for quick access.

Image: A finger touching the fingerprint sensor on the door knob.
The lock supports up to 20 access codes.
Video: K02APRO Smart Door Knob-Note. This video highlights important notes and tips for using the K02APRO Smart Door Knob, including specific operational details or common considerations.

Image: The smart door knob's auto-locking feature, showing a 5-second auto-lock timer.

Image: Managing users and checking unlock records through the app.
The smart door knob is powered by 4 AAA ALKALINE batteries. When the battery level is low, the app will provide a low battery alarm. Replace all four batteries simultaneously with new alkaline batteries.

Image: Recommendation to use Alkaline batteries for longer life and safety.
In case of complete battery depletion, the lock features a Type-C port for emergency power. Connect a power bank or a Type-C cable to temporarily power the lock and gain access.
Wipe the door knob with a soft, dry cloth. Avoid using abrasive cleaners, solvents, or harsh chemicals, as these can damage the finish and electronic components.
| Problem | Possible Cause | Solution |
|---|---|---|
| Lock does not respond. | Batteries are dead or incorrectly installed. | Replace batteries with new AAA alkaline batteries. Check polarity. Use emergency Type-C power if needed. |
| Fingerprint not recognized. | Finger is dirty, wet, or not placed correctly. Fingerprint not properly enrolled. | Ensure finger is clean and dry. Place finger firmly on the sensor, covering the entire area. Re-enroll fingerprint if issues persist. |
| Keypad not responding. | Incorrect passcode entered. Keypad malfunction. | Verify the passcode. Try using the app or mechanical key. Contact support if keypad remains unresponsive. |
| App cannot connect to the lock. | Bluetooth is off. Out of Bluetooth range. Lock is offline. | Ensure Bluetooth is on. Move closer to the lock. If the lock is offline, revoke it with fingerprint first and then reconnect in the app. |
| Auto-lock not working. | Auto-lock feature is disabled in the app. Door sensor issue. | Check auto-lock settings in the Smart Life/Tuya App. Ensure the door closes completely and the sensor detects closure. |
| Feature | Detail |
|---|---|
| Model Name | K02APRO |
| Unlock Ways | Fingerprint, Passcode, App Control, Mechanical Key |
| Fingerprint Capacity | Up to 18 fingerprints |
| Passcode Capacity | Up to 20 passcodes |
| Power Source | 4 x AAA ALKALINE batteries (not included) |
| Emergency Power | Type-C USB port |
| Material | Aluminum |
| Finish Type | Matt Black |
| Dimensions (L x W x H) | 2.24 x 0.98 x 3.35 inches |
| Item Weight | 1.39 Pounds |
| Connectivity | Bluetooth |
| Operating Temperature | Refer to product packaging for specific range |
GHome Smart products typically come with a manufacturer's warranty covering defects in materials and workmanship. Please refer to the product packaging or the official GHome Smart website for specific warranty terms and duration.
For any questions, technical assistance, or warranty claims, please contact GHome Smart customer service. You can usually find contact information (email or phone) on the product packaging, the official GHome Smart website, or through your purchase platform. Please have your model number (K02APRO) and purchase details ready when contacting support.
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