Master Lock Key Lock Box 5400EC - Secure Outdoor Key Storage

In this review the Master Lock Key Lock Box 5400EC is judged on practicality and durability for homeowners, landlords and hosts who need a simple, mechanical solution for key access. The single biggest reason to buy is its straightforward combination mechanism and roomy interior that holds up to five standard 2 in house keys, removing the need to hand out duplicates or hide keys in risky spots. For those who want a low-tech, weatherprotected option that fits most doorknobs, this box delivers clear, usable security without electronics.

Key Features

• Large capacity: Holds up to five standard 2 in house keys so small families or shortterm rentals can keep multiple keys in one secure place.
• Resettable 4digit code: Lets you set and change your own combination for thousands of personalized codes without special tools.
• Weather protection: Metal body with a shuttered door helps shield the combination dials from rain and snow for outdoor use.
• Durable construction: Vinyl coated shackle prevents scratching of knobs while the metal body offers sturdy protection against casual tampering.
• Fits most knobs: Shackle dimensions are sized to fit most ball, biscuit, and tulip doorknob styles for flexible mounting.

Who It's For

Homeowners who need a reliable, nonbattery backup for giving access to guests, contractors or family will find this lock box useful. It is also a good fit for real estate agents, Airbnb hosts and caregivers who need an easily shared code rather than managing key exchanges.

Those who need highresistance commercial grade vaulting or electronic access control should look elsewhere; this box is designed for convenience and moderate security rather than heavy duty forcedentry resistance. Also, if you need to store oversized fobs or very large keys, verify dimensions first because interior space is sized for standard 2 in keys.

Pros & Cons

Pros

• Simple, resettable four digit combination that is easy to change when access needs shift.
• Roomy interior that accommodates up to five standard keys, reducing the need for duplicate key management.
• Solid metal body and vinyl coated shackle deliver practical protection and prevent knob scratching.
• Good value for routine residential and shortterm rental use where convenience matters more than heavy security.

Cons

• Some customers report mixed longterm durability under harsh conditions, so performance can vary by environment.
• Interior dimensions limit the box to standard keys and may not accept bulkier electronic fobs.

Specifications

Exterior dimensions	6-1/4 in H x 3-1/4 in W x 1-1/2 in D
Interior dimensions	1 in H x 2-13/32 in W x 1 in D
Shackle length	1-13/32 in
Shackle width	1-7/8 in
Shackle diameter	13/32 in
Key capacity	Up to 5 standard 2 in house keys

Our Verdict

The Master Lock 5400EC is a practical, economical choice for anyone who needs a simple, nonpowered way to share access. It balances a roomy interior and an easy to reset combination lock with weather protective features, making it a sensible buy for residential use, shortterm rentals and caregiver situations where convenience and value matter most.

Frequently Asked Questions

How many keys will it hold?
The box holds up to five standard 2 in house keys.

Can the combination be changed?
Yes, you can reset the four digit combination to thousands of personalized codes without tools.

Is it suitable for outdoor installation?
Yes, the metal body and shuttered door offer weather protection for outdoor use, though extreme conditions may affect longterm durability.