Thmosz DA

Thmosz 3.0 CUFT Digital Home Security Safe Instruction Manual

Model: DA

Brand: Thmosz

1. Introduction

This manual provides detailed instructions for the safe and effective use of your Thmosz 3.0 CUFT Digital Home Security Safe. This safe is designed to protect your valuables with its robust construction and advanced locking mechanisms. Please read this manual thoroughly before initial use and retain it for future reference.

Thmosz 3.0 CUFT Digital Home Security Safe with door open, showing various valuables like a camera, books, jewelry, gold bars, and cash stored inside.

Figure 1: Thmosz 3.0 CUFT Digital Home Security Safe, open with contents.

The Thmosz 3.0 CUFT safe features heavy-duty steel construction, a programmable digital keypad, and multiple unlocking options. It includes a removable shelf for organized storage and is designed for secure installation to a wall or floor.

2. Package Contents

Verify that all items listed below are included in your package:

  • 1 x Safe Box
  • 2 x Emergency Keys
  • 4 x Expansion Bolts
  • 1 x Removable Shelf
  • 1 x Floor Mat
  • 1 x User Manual (this document)
  • 1 x External Battery Box
Image showing all included components: safe box, emergency keys, expansion bolts, removable shelf, floor mat, user manual, and external battery box.

Figure 2: Included components of the Thmosz safe.

3. Product Features

  • Heavy Duty Steel Construction: Crafted from sturdy steel with 20mm diameter door bolts and pry-resistant concealed hinges. Features an anti-scratch and stain-resistant powder coat finish.
  • 3.0 CU FT Large Capacity: Interior dimensions allow for storage of various valuables such as money, firearms, jewelry, documents, and medicines. Includes a removable shelf for flexible organization.
  • Multiple Unlocking Modes: Access via a digital keypad, two emergency keys, or an emergency battery compartment for power loss.
  • Alarm Function: An audible alarm sounds for 20 seconds after three incorrect entries, and for 5 minutes after three additional incorrect attempts.
  • Mute Function: Option to silence keypad beeps for discreet operation.
  • Interior LED Light: Provides visibility inside the safe, especially in low-light conditions.
  • Secure Installation: Pre-drilled holes in the bottom and back allow for permanent affixing to a wall or floor using included expansion screws.
Close-up of the safe's door showing three robust locking bolts, each 20mm in diameter, with text indicating 'Sturdy Steel Material, Anti-Drilling and Anti-Prying'.

Figure 3: Detail of the safe's three 20mm locking bolts.

Image showing the safe's interior with the removable shelf installed, holding passports, cards, camera, books, jewelry, gold, and cash.

Figure 4: Interior view with removable shelf for organized storage.

4. Setup

4.1 Battery Installation

The safe requires 4 AA batteries (not included) for the electronic keypad. Open the battery compartment located on the inside of the safe door and insert the batteries, ensuring correct polarity. Close the compartment securely.

4.2 Initial Opening (First Use)

For the first opening, use one of the emergency keys. Insert the emergency key into the keyhole on the keypad panel and turn it clockwise. Simultaneously turn the knob on the keypad panel clockwise to open the safe door.

Diagram showing how to open the safe using the emergency key and turning the knob.

Figure 5: Initial opening with emergency key.

4.3 Secure Installation (Wall/Floor Mounting)

To enhance security, the safe can be permanently affixed to a wall or floor. Pre-drilled holes are located on the back and bottom of the safe. Use the included expansion bolts for installation.

  1. Choose a suitable location for installation, ensuring a solid surface (e.g., concrete wall or floor joist).
  2. Position the safe and mark the drilling points through the pre-drilled holes.
  3. Drill pilot holes into the wall or floor at the marked positions.
  4. Align the safe with the drilled holes and insert the expansion bolts.
  5. Tighten the bolts securely to fix the safe in place.
Diagram illustrating the three steps for wall mounting the safe: marking holes, drilling, and securing with bolts.

Figure 6: Wall or floor mounting instructions.

5. Operating Instructions

5.1 Setting/Changing the Passcode

With the safe door open, locate the red reset button on the inside of the door. Press the reset button. The indicator light on the keypad will illuminate. Enter your desired 3-8 digit passcode, then press the "#" key to confirm. Test the new passcode with the door open before closing it.

5.2 Unlocking the Safe

There are three methods to unlock your safe:

  1. Digital Keypad: Enter your 3-8 digit passcode, then press "#". The green light will illuminate. Within 5 seconds, turn the knob clockwise to open the door.
  2. Emergency Key: Insert the emergency key into the keyhole and turn it clockwise. Simultaneously turn the knob clockwise to open the door. This method bypasses the electronic lock.
  3. External Battery Box (Emergency Power): If the internal batteries are depleted, connect the external battery box (with 4 AA batteries installed) to the emergency power port on the keypad. Then, enter your passcode and turn the knob as with the digital keypad method.
Diagram showing the three methods to open the safe: emergency key + knob, password + knob, and emergency battery box + password + knob.

Figure 7: Overview of the three unlocking methods.

Diagram showing how to open the safe using the digital keypad and turning the knob.

Figure 8: Opening with digital keypad.

Diagram showing how to use the emergency battery box to power the keypad for opening.

Figure 9: Opening with external battery box.

5.3 Mute Function

To enable or disable keypad sounds:

  • To turn on sound: Press "**66".
  • To turn off sound: Press "**633".
Image showing the keypad with instructions for activating and deactivating the mute function.

Figure 10: Mute function activation/deactivation.

5.4 Alarm Function

The safe is equipped with an alarm system to deter unauthorized access:

  • If three incorrect passcodes are entered consecutively, the built-in alarm will sound for 20 seconds.
  • If three additional incorrect attempts are made after the initial alarm, the alarm will sound for 5 minutes.
Image depicting the safe with an alarm siren icon and text 'Wrong Passwords Alarm', indicating the alarm system.

Figure 11: Alarm system activation due to incorrect entries.

5.5 Interior LED Light

The safe includes an internal LED light to illuminate the contents. This light activates automatically when the door is opened and provides convenience in dimly lit environments.

6. Maintenance

  • Battery Replacement: Replace the batteries when the low battery indicator light illuminates or if the keypad becomes unresponsive. Always use 4 new AA alkaline batteries.
  • Cleaning: Wipe the safe's exterior with a soft, damp cloth. Avoid abrasive cleaners or solvents that could damage the finish.
  • Key Storage: Store emergency keys in a secure location away from the safe. Do not store them inside the safe.

7. Troubleshooting

ProblemPossible CauseSolution
Safe does not open with passcode.Incorrect passcode entered; batteries are low or dead.Re-enter passcode carefully. Replace batteries or use the external battery box. Use emergency key if necessary.
Alarm sounds unexpectedly.Multiple incorrect passcode entries.Enter the correct passcode to silence the alarm.
Keypad is unresponsive.Batteries are completely dead.Use the external battery box to power the keypad, or use the emergency key.
Forgotten passcode.Passcode has been forgotten.Use the emergency key to open the safe. Once open, reset the passcode using the internal reset button.

8. Specifications

  • Brand: Thmosz
  • Model Number: DA
  • Capacity: 3.0 Cubic Feet
  • Material: Alloy Steel
  • Color: Black
  • Lock Type: Electronic Combination Lock, Key
  • Mounting Type: Wall or Floor Mount
  • Product Dimensions: 12.21 x 13.7 x 19.6 inches (Depth x Width x Height)
  • Item Weight: 35.7 pounds
  • Alarm: Audible
  • Water Resistance Level: Waterproof
  • Batteries Required: Yes (4 x AA, not included)
Image showing the Thmosz safe with dimensions labeled: 50cm/19.6 inches height, 31cm/12.2 inches depth, 35cm/13.7 inches width.

Figure 12: Product dimensions.

9. Warranty and Support

For warranty information or technical support, please refer to the documentation provided with your purchase or contact Thmosz customer service directly. Contact details are typically available on the manufacturer's website or product packaging.

© 2026 Thmosz. All rights reserved.

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