1. Introduction
This manual provides essential instructions for the safe and proper use, installation, and maintenance of your KAER 20 Biometric Gun Safe. Please read this manual thoroughly before operating the safe and retain it for future reference. Proper understanding of these instructions ensures optimal performance and security.
2. Important Safety Information
- Always store firearms unloaded and locked within the safe.
- Keep keys, passwords, and fingerprints secure and away from unauthorized individuals, especially children.
- Do not store the emergency keys inside the safe.
- Ensure the safe is securely mounted to a floor or wall to prevent unauthorized removal.
- Regularly check battery levels and replace them as needed to ensure continuous functionality of the electronic lock.
3. Product Overview
The KAER 20 Biometric Gun Safe is designed for secure storage of rifles and pistols. It features multiple access methods including biometric fingerprint, keypad, and emergency keys. The interior is designed for organized storage with adjustable racks and pistol pouches.
3.1 Key Features
- Capacity: Accommodates 15-20 rifles/pistols up to 49.8" long with shelf, or up to 56" without.
- Access Methods: High-precision semiconductor fingerprint scanner (up to 30 fingerprints), keypad (3-12 digit password), and emergency keys.
- Construction: 16-gauge cold-rolled steel with three powerful locking bolts and 60mm thick solid steel door panels.
- Interior: 3 flexibly adjustable gun racks, removable shelf, 3 ammunition bins, and 2 pistol pouches.
- Security Features: Dual alarm system (70dB for unauthorized access/vibration), silent mode.
- Assembly: No assembly required; comes pre-assembled with pre-drilled holes and mounting hardware.
3.2 Components

- Removable Shelf
- Height-adjustable Gun Rack
- Removable/Adjustable Shelf
- Bullet Rack
- Pistol Pouch
- Setting Button (Green button on the back of the door)
- Locking Bolt
- External Battery Compartment
4. Setup
4.1 Unpacking and Initial Inspection
Carefully remove the safe from its packaging. Inspect the safe for any signs of damage during transit. Report any damage to the retailer immediately.
4.2 Installing Batteries
The safe requires 4 AA alkaline batteries (not included) for the electronic lock system. The battery compartment is located behind the keypad/fingerprint module.
- Locate the emergency keyhole on the keypad module.
- Insert an emergency key and turn it to unlock the module cover.
- Carefully remove the module cover to expose the battery compartment.
- Insert 4 AA alkaline batteries, ensuring correct polarity (+/-).
- Replace the module cover and secure it.
4.3 Mounting the Safe
The safe comes with pre-drilled holes and mounting hardware for secure installation to a floor or wall. It is highly recommended to secure the safe to prevent unauthorized removal.
- Choose a discreet and secure location for the safe.
- Mark the drilling points through the pre-drilled holes on the back or bottom of the safe onto the wall or floor.
- Drill pilot holes at the marked locations.
- Position the safe and align the holes.
- Secure the safe using the provided bolts and hardware.

5. Operating Instructions
5.1 Opening the Safe
The safe can be opened using a fingerprint, a digital password, or an emergency key.
5.1.1 Fingerprint Access
- Place a registered finger on the fingerprint scanner.
- The safe will emit a confirmation sound (e.g., "beep") and the handle can be turned to open the door.
5.1.2 Keypad Access
- Wake up the keypad by touching it.
- Enter your 3-12 digit password followed by the "#" key.
- The safe will emit a confirmation sound and the handle can be turned to open the door.
5.1.3 Emergency Key Access
In case of battery failure or forgotten password/fingerprint, use the emergency key.
- Locate the emergency keyhole on the keypad module.
- Insert an emergency key and turn it to unlock the module cover.
- Insert the emergency key into the mechanical lock behind the module and turn it.
- Turn the handle to open the safe door.

5.2 Setting Passwords and Fingerprints
5.2.1 Setting the First Digital Password
The initial password is "123456". To set your first personal password:
- Open the safe door.
- Wake up the keypad.
- Enter "00" on the keypad.
- Press the green setup button located on the back of the door (refer to Figure 1, item 6).
- Enter your desired 3-12 digit password, then press the "#" button to confirm.
5.2.2 Setting the Second Digital Password
To set a second personal password:
- Open the safe door.
- Wake up the keypad.
- Enter "11" on the keypad.
- Press the green setup button located on the back of the door.
- Enter your desired 3-12 digit password, then press the "#" button to confirm.
5.2.3 Registering Fingerprints
The safe can store up to 30 fingerprints.
- Open the safe door.
- Press the green setup button located on the back of the door.
- Place the finger you wish to register on the center of the fingerprint sensor.
- After hearing two short beeps, remove your finger and press again. Repeat this step four times for a complete registration.
- A long beep indicates successful registration.
5.3 Alarm System and Silent Mode
The safe is equipped with an alarm system and a silent mode feature.
5.3.1 Alarm Feature
The safe features an auto-alarm that triggers a 70dB alert upon detecting unauthorized access attempts or significant vibration. If an incorrect password is entered three times, or an incorrect fingerprint is scanned five times, the system will trigger an alarm and temporarily disable electronic access for 3 minutes. Mechanical backup keys remain functional during lockout.

5.3.2 Silent Mode
To enable or disable silent mode, enter "11#" on the keypad. This allows for quiet operation in noise-sensitive environments.
5.4 Interior Organization
The safe's interior is designed for flexible organization:
- Adjustable Gun Racks: Three flexible gun racks can be adjusted to accommodate firearms of various sizes.
- Removable Shelf: A removable shelf allows for storage of longer rifles (up to 56 inches) when removed, or additional storage space when installed.
- Pistol Pouches and Ammunition Bins: Dedicated storage on the door and within the safe for pistols and ammunition.

6. Maintenance
- Battery Replacement: Replace batteries annually or when the low battery indicator appears. Use only 4 AA alkaline batteries.
- Cleaning: Clean the exterior of the safe with a soft, damp cloth. Avoid abrasive cleaners or solvents. Do not use liquids near the electronic components.
- Lock Mechanism: Do not lubricate the lock mechanism. It is designed to be maintenance-free.
- Security Check: Periodically check the mounting bolts to ensure they are tight and secure.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Safe does not open with fingerprint/keypad. | Low batteries, incorrect password/fingerprint, electronic lockout. | Replace batteries. Re-enter correct password/fingerprint. Use emergency key if locked out. |
| Alarm sounds unexpectedly. | Unauthorized access attempt, vibration detected. | Deactivate alarm by entering correct password/fingerprint. Check for tampering. |
| Keypad unresponsive. | Dead batteries. | Replace batteries using the emergency key access method. |
| Cannot register new fingerprint/password. | Incorrect procedure, memory full. | Follow registration steps carefully. Consider restoring factory settings if memory is full or for a fresh start. |
8. Specifications
| Feature | Detail |
|---|---|
| Brand | KAER |
| Model Number | SF20251004B0F4KKJ1M3 |
| Product Dimensions (D x W x H) | 13.78"D x 18.9"W x 57"H |
| Item Weight | 92.6 Pounds |
| Material | Alloy Steel |
| Lock Type | Biometric, Electronic Combination Lock, Key |
| Color | Black |
| Capacity | 0.4 Cubic Feet (Interior designed for 15-20 rifles/pistols) |
| Mounting Type | Wall Mount, Floor Mount |
| Included Components | 2 Back-Up Keys, Bolts, 3-Spoke Handle |
| Alarm | Audible (70dB) |
9. Warranty and Support
KAER provides comprehensive support for your gun safe:
- Warranty: 1-year full warranty, lifetime core component service.
- Customer Support: 24/7 online support. For assistance, you can:
- Click on the seller's username on the product page to ask questions.
- Send a message regarding previous orders.