Master Lock Key Lock Box with Code - Bluetooth Key Safe for Rentals

In this review of the Master Lock 5440EC key lock box, the bottom line is simple: it is a practical solution for realtors, property managers and short-term rental hosts who need secure, trackable key access without a complicated install. The reviewer found the device useful for storing multiple keys and key cards in a weather resistant portable body while offering convenient opening via smartphone or keypad code. For teams that want simple temporary access, activity notifications and easy battery replacement, this lock box covers the basics well.

Key Features

• Bluetooth and code access: Open and share temporary or permanent access using the Master Lock Vault App or a keypad code, so guests can enter without physical key exchanges.
• Large internal cavity: The roomy interior holds multiple traditional keys or key cards, making it suitable for small property turnovers and rental check-ins.
• Weather resistant construction: Built for indoor or outdoor use with a coated surface and solid body durability to protect hardware and door finish from the elements.
• Activity monitoring: Use the app to monitor visits, receive tamper and low-battery alerts, and track who accessed the box when.
• Removable shackle: The shackle can be managed by app or code and allows mounting to railings or fixtures for flexible placement.
• Upgradeable platform: The Vault Home app supports up to 10 locks and can be upgraded to an enterprise platform for integration with scheduling tools.

Who It's For

The 5440EC is well suited to hosts and managers of short-term rentals, realtors showing multiple properties, and property owners who need a portable, monitored key solution. Its combination of keypad and smartphone control makes it handy for handing out temporary access without rekeying or in-person handoffs.

Those who need to store bulky key fobs should look elsewhere because the box is not intended to securely fit most fobs. Also, users who require constant remote unlocking over the internet should note that Wi-Fi is not required and Bluetooth is the primary wireless method; integration with enterprise services is available but may require platform upgrade.

Pros & Cons

Pros

• Sturdy, weather resistant body and coated finish provide reliable outdoor performance.
• Convenient Bluetooth and keypad access with temporary code features reduces key handoffs.
• Large internal cavity fits multiple traditional keys or key cards for common rental needs.
• Replaceable CR123A battery included and easy to swap when low-battery alerts arrive.

Cons

• Bluetooth features receive mixed feedback from users and some found code management confusing or limited.
• Not designed to securely hold larger key fobs, limiting use for some vehicle or smart-fob setups.

Specifications

Model	5440EC
Lock body width	3-1/4 in
Shackle diameter and length	13/32 in diameter, 1-13/16 in length
Internal dimensions	3-39/64 in H, 2-1/2 in W, 1-7/64 in D
Battery	Replaceable CR123A battery (included)
App support	Master Lock Vault Home and Enterprise options

Our Verdict

The Master Lock 5440EC is a sensible, cost-effective key safe for hosts, property managers and real estate professionals who need monitored, temporary access without complicated infrastructure. It strikes a useful balance of durability, capacity and app-driven control, making it good value for anyone who regularly handles key turnover, provided they do not need to store large fobs or depend on always-on remote unlocking.

Frequently Asked Questions

Can the lock box be used outdoors?
Yes, the box is weather resistant and designed for indoor or outdoor use with a coated surface to protect hardware.

Does it require Wi-Fi to operate?
No, Wi-Fi is not required; the primary wireless method is Bluetooth, and codes work without an internet connection.

How many keys will it hold?
The large internal cavity holds multiple traditional keys or key cards but is not intended for most large key fobs.