Master Lock wall-mount key lock box 5-key capacity, black with weather cover — push-button 4-character combination

The Master Lock 5423EC is a wall-mounted, push-button key lock box that stores up to five keys and uses a user-set 4-character combination for secure, keyless access.

If you need a compact, weather-resistant way to share or protect house keys, this metal lock box is built to mount permanently to a fixed surface and withstand outdoor conditions. The push-button combination eliminates loose keys or spare-key hiding spots while providing quick access for family members, caretakers, or service personnel. Its metal body, protective cover and coated shackle reduce wear and limit surface damage to surrounding areas.

How do I set and change the combination on the lock box?

Programming the 4-character alpha/numeric combination is straightforward and does not require specialized tools. You can personalize the code and reset it whenever access needs change.

• Use the factory instructions to clear the default code first.
• Enter and confirm your new four-character combination.
• Test the new code several times before closing the box with keys inside.

Will the lock box handle outdoor exposure and harsh weather?

The 5423EC is designed for both indoor and outdoor placement. A protective weather cover shields the push buttons from rain and debris, and the metal housing resists routine outdoor wear.

• Weather cover reduces freezing and button jams in cold conditions.
• Metal body offers durable corrosion resistance compared with plastic alternatives.
• Molded bumper and vinyl-coated shackle protect doors and surfaces from scratches.

How much will it hold and what are the dimensions?

This compact safe accommodates up to five standard house keys and fits on most walls or fixed anchors. Check your installation area against the listed exterior and interior measurements before mounting.

• Exterior size: 4-5/8" H x 3-1/8" W x 2-1/16" D (11.7 x 7.9 x 5.2 cm).
• Interior space: 3-1/2" H x 2-1/4" W x 1" D (8.9 x 5.7 x 2.5 cm), roughly 7.9 cubic inches.
• Rated capacity: holds up to five keys or similar small items.

How is the lock box installed and secured to a property?

The unit is intended for permanent mounting to a wall or other fixed object using the included hardware. Proper placement ensures stable operation and prevents easy removal by unauthorized persons.

• Hardware for wall-mounting is included in the package.
• Choose a solid mounting surface and measure to avoid obstruction from doors or trims.
• Verify backset and clearances to make sure the box sits flush and operates smoothly.

Who is this for: The Master Lock 5423EC is a practical choice for homeowners, landlords, property managers, caregivers, or anyone who needs dependable, shared access to a residence without distributing duplicate keys. It fits situations where a durable, permanently mounted key container is preferred—especially for outdoor or seasonal-use locations—and for users who want a programmable, non-electronic solution backed by a recognizable warranty.