1. Setup
1.1 Unpacking
Carefully remove the safe from its packaging. Inspect the safe for any signs of damage. Ensure all components are present:
- Stack-On PS-1820-E Security Safe
- Backup Keys (2)
- Adjustable Shelves (2)
- Padded Shelf Liners (3)
- Mounting Hardware
- User Manual
1.2 Battery Installation
The electronic lock requires batteries for operation. Locate the battery compartment, typically on the inside of the safe door or behind the keypad. Install the required batteries (usually AA, not included) according to the polarity markings.
1.3 Mounting the Safe
For enhanced security, it is recommended to mount the safe to a floor or wall. The safe includes pre-drilled mounting holes and hardware. Choose a secure location and follow these general steps:
- Position the safe in the desired location.
- Mark the drilling points through the pre-drilled holes on the back or bottom of the safe.
- Move the safe and drill pilot holes using an appropriate drill bit for your mounting surface.
- Reposition the safe and secure it using the provided mounting hardware.

Image: The Stack-On PS-1820-E safe shown mounted in a closet, demonstrating a typical installation scenario.
2. Operating Instructions
2.1 Setting Your Personal Code
Your safe comes with a factory default code. It is crucial to change this to a personal code immediately after battery installation. Refer to the specific instructions provided with your safe for the exact procedure, which typically involves pressing a reset button (often inside the door), entering your new 3-8 digit code, and confirming it.
2.2 Opening the Safe with Your Code
To open the safe using your electronic code:
- Enter your 3-8 digit personal code on the keypad.
- Press the '✓' (check mark) button to confirm.
- Within 5 seconds, turn the handle clockwise to open the door.

Image: A detailed view of the electronic keypad and handle on the safe door, highlighting the input interface.
2.3 Using the Backup Keys
In case of electronic lock failure or forgotten code, backup keys are provided. To use them:
- Locate the keyhole, usually concealed behind a removable cover on the keypad.
- Insert the backup key and turn it to unlock.
- Turn the handle to open the door.
2.4 Adjusting Shelves
The safe includes two adjustable shelves and three padded liners to customize storage space. The shelves can be removed or repositioned to accommodate items of various sizes.

Image: The interior of the safe showing two adjustable shelves and padded liners, illustrating the customizable storage options.
2.5 Silent Mode
The electronic lock features a silent mode for discreet entry. Consult your specific manual for instructions on how to activate or deactivate this feature.
2.6 Low Battery Warning
The electronic lock will indicate a low battery condition (e.g., flashing light, audible beeps) when power is running low. Replace batteries promptly to avoid being locked out.
2.7 Locking the Safe
To lock the safe:
- Close the safe door firmly.
- Turn the handle counter-clockwise until it locks into place. The electronic lock will automatically engage.
2.8 Product Overview Video
Watch this video for a general overview of Stack-On products and their features.
Video: A brief overview of Stack-On products, showcasing various features and applications of their security solutions.
3. Maintenance
Proper maintenance ensures the longevity and reliable operation of your safe:
- Cleaning: Wipe the exterior with a soft, damp cloth. Avoid abrasive cleaners.
- Battery Replacement: Replace batteries annually or when the low battery warning activates. Always use new, high-quality batteries.
- Key Storage: Store backup keys in a secure location away from the safe.
4. Troubleshooting
If you encounter issues with your safe, consider the following:
- Safe will not open with code: Ensure batteries are fresh and installed correctly. Re-enter the code carefully. If unsuccessful, use the backup key.
- Keypad is unresponsive: Replace batteries. If the issue persists, contact customer support.
- Door will not close/lock: Check for any obstructions preventing the door from closing completely. Ensure the handle is turned fully to the locked position.
- Forgotten Code: Use the backup keys to open the safe and reset the code according to the instructions in Section 2.1.
5. Specifications
| Brand | Stack-On |
| Model Number | PS-1820-E |
| Product Dimensions | 13"D x 13.75"W x 19.75"H |
| Lock Type | Electronic Combination Lock |
| Color | Matte Black |
| Material | Alloy Steel |
| Special Features | Fire Resistant, Removable Shelf |
| Mounting Type | Freestanding, Tabletop |
| Included Components | Backup keys, Mounting hardware |
| Item Weight | 43.6 Pounds |
| Water Resistance Level | Not Water Resistant |
| Power Source | Battery powered |
6. Warranty Information
This Stack-On product is covered by a manufacturer's warranty. Please refer to the warranty card included with your purchase or visit the official Stack-On website for detailed terms and conditions regarding coverage, duration, and how to make a claim.
7. Customer Support
For technical assistance, troubleshooting, or inquiries regarding your Stack-On PS-1820-E Personal Steel Security Safe, please contact Stack-On customer support. Contact information can typically be found on the product packaging, the official Stack-On website, or the warranty documentation.
