• Padlocks

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  • Master Lock 5440EC

    Bluetooth Portable Lock Box

    SKU: 5440EC

    Master Lock

    A must for selling real estate! Remotely control, manage access, and monitor usage for unlimited Bluetooth series lock boxes with the powerful Master Lock Vault Enterprise smartphone app and site. Install this weather-resistant keyless portable lock box anywhere you need key and keycard storage. Integrates with ShowingTime® property showing management tool for realtors, agents and brokers.

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    3 Years of SHIELD Coverage

    Product Replacement | Extended Return Policy | Price Protection

    Terms and Conditions


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    • Large storage capacity portable lock box for keys and access cards
    • Removable shackle for added convenience (no shackle model also available)
    • Open and manage with your smartphone
    • Works with both the Master Lock Vault Home App for personal use and Master Lock Vault Enterprise for business use (details below)
    • Can also be accessed by entering a traditional code on the keypad
    • Schedule access now or in the future
    • Provide permanent or temporary access
    • Use the App or web to track usage
    • Low battery warnings
    • Easy to replace battery (CR123A preinstalled)
    • Weather-resistant 3 1/4 in. wide metal body

    Master Lock Vault Enterprise

    • Efficiently manage access to ensure the right users have the right access
    • Simplify security set-up with bulk user and lock uploads
    • Automatically map lock and lock box locations via smartphone
    • Easily monitor access with robust data and audit trails
    • Assured back-up entry method using manual, directional or numeric code
    • Leverage the security of 256-bit, military-grade encryption

    Real Estate

    • No long-term contracts, monthly or shared access fees
    • Share access quickly and easily with showing agents, contractors, inspectors or even homeowners
    • Conveniently schedule temporary, permanent or future access
    • Monitor activity by device and user
    • Integrated with ShowingTime®, the leading real estate showing and scheduling management provider

    Facilities Management

    • Secure areas, materials, equipment, keys or keycards
    • Easily assign access to groups or individuals by time and date
    • Efficiently manage many locks and many users
    • Increase accountability with audit trail of who accessed devices and when

    Note: This model replaces the Master Lock 5440D and 5440ENT lockboxes

    Master Lock’s sturdy weather-resistant Bluetooth lock boxes just got an upgrade with the Master Lock Vault Enterprise system. Built with businesses in mind, Master Lock Vault Enterprise provides a flexible and user-friendly system for keyless lock and lock box management through the it’s web interface and smartphone app. Your smartphone becomes a smart key, eliminating the need for physical keys as well as the time and money spent rekeying, replacing and duplicating keys.

    Administrators can create scheduled or permanent access for individuals and customizable groups. Always know where your locks are through automatic mapping and know when they’re being access through detailed audit trails. Enterprise enabled locks and lock boxes also integrate with ShowingTime® showing management tool, providing realtors and brokers with a one-stop solution for lock scheduling and access.


    Manufacturer Master Lock
    Battery Type CR123A
    Color Black, Silver
    Smartphone Compatibility Android 5.0 or later, iOS 10 or later
    Warranty 1 Year Manufacturer
    Access Type Keypad - Digits
    Brand Master Lock

    Door requirements

    Battery Life 2 Years


    Code Length up to 8 digits
    Users Unlimited
    Wireless Protocol Bluetooth BLE


    Exterior Dimensions 5 (H) x 3-1/4 (W) x 2-5/16 (D) in.
    Inside Dimensions ["3-39/64 (H) x 2-1/2 (W) x 1-7/64 (D) in."]
    Exterior Dimensions 5 (H) x 3-1/4 (W) x 2-5/16 (D) in.
    Shackle Dimensions A: 13/32in (10mm) B: 1-13/32in (36mm) C: 1-13/16in (46mm)
    Weight 3 lbs

    Q: What if my Guest does not have a Bluetooth enabled device to utilize the lock box?
    A: Your Guest can access the lock without a Bluetooth enabled device by entering a Manual Code on the lock keypad. To assign secondary code access with no expiration:

    If not already logged on, open the Master Lock Vault eLocks App and touch the appropriate lock box listed in the LOCKS list.
    Touch MANAGE LOCK in the upper right corner of the App.
    Scroll down to Secondary Codes and touch CHANGE SECONDARY CODES then follow the App instructions to add up to 5 secondary codes.
    To assign a temporary code access with an expiration:

    If not already logged on, open the Master Lock Vault eLocks App and touch the appropriate lock box listed in the LOCKS list.
    Touch MANAGE LOCK in the upper right corner of the App.
    Touch the Settings Icon in the upper right corner of the App.
    Touch SHARE TEMPORARY CODES and then follow the App instructions to share current or future codes.

    Q: What if my phone battery dies? How can I access my Bluetooth Lock Box?
    A: If the phone's battery dies, the lock can be unlocked by entering the Primary Code, the current Temporary Code or the Backup Master Code on the lock keypad.

    Q: How long will the batteries last on my Master Lock Safe Space Portable or Wall-Mount Bluetooth Lock Box?
    A: The Master Lock Safe Space Portable or Wall Mount Bluetooth Lock Box battery should last at least 2 years under normal usage.

    Q: Why does my Bluetooth Lock Box not seem to be functioning properly?
    A: Check to see if the firmware on your Padlock or Lock Box is up to date:

    Sign into your Master Lock Vault eLocks account
    Select your lock from the “Locks list”
    Select ”Manage Locks”
    Select the Gear icon in the top right corner
    Select “About this Lock”
    If a firmware update is available, you will see the message “There is a firmware update available!”
    Press the “Download and Install” button
    Press the “Install Update” button
    Make sure the lock is awake and remain within 2 feet of it while the update installs
    You will be notified when the update has successfully completed

    Q: Is it possible to update the firmware on the lock box?
    A: Yes, when a firmware update for your lock box is available. You’ll be notified within the App whenever an update is available. You can also manually check for firmware updates by navigating to the ABOUT THIS LOCK page in the lock settings menu.

    Q: How many lock boxes can I add to my Master Lock Vault Enterprise account?
    A: There currently is no limit to the number of lock boxes you can add to a Master Lock Vault Enterprise organization account.

    Q: Do I need a pin or key card to access my lock box?
    A: Master Lock Bluetooth Lock Boxes have been designed for ease of use and security. When opening with Bluetooth credentials through the Master Lock Vault APP, no pin code or key card is needed. Primary and secondary codes are only used as an alternative form of entry.

    Q: How do I revoke my lock box's access to a guest?
    A: To ensure a guest can no longer access a lock, the lock owner, should 1) Revoke Guest Access or Delete the Guest AND 2) Perform the RESET KEYS function within proximity of the lock.

    Under YOUR LOCKS, touch the lock for which you wish to remove a guest.
    Touch MANAGE LOCK in the upper right corner. Enter your passcode, if prompted.
    Swipe the guest record to the left.
    Touch the DELETE icon.
    Select REVOKE ACCESS (to revoke the guest's access to this lock only) or DELETE (to delete the guest from all locks).
    Your guest will receive an email notification that their access has been revoked.
    Make sure that the owner’s device that is synced to the lock is within proximity of the lock (reset keys cannot be performed remotely).
    Select the lock from the LOCKS list.

    Touch MANAGE LOCK in the upper right corner. Enter your passcode, if prompted.
    Touch the SETTINGS icon in the upper right corner.
    Touch RESET KEYS.
    Follow any additional instructions in the APP to save the changes to your lock. This step must be completed for each lock in instances where there is a lost or stolen device.

    Q: What phones are compatible with Master Lock Bluetooth lock boxes?
    A: The Master Lock Safe Space Bluetooth Lock Boxes are designed to work with devices that are built to Bluetooth v4.0 (or higher) specifications and implement the capability to communicate with Bluetooth Smart peripherals. iOS and Android platforms are currently supported. See Compatible Devices.

    Q: Are these lock boxes susceptible to Bluetooth 'hacking'?
    A: Master Lock utilizes Bluetooth Smart technology to facilitate wireless communication between locks and mobile devices. These locks and lock boxes are designed in a way that prevents the threat of Bluetooth hacking that exists with some other Bluetooth products. To provide leading-edge security, we employ robust, military-grade authentication and encryption mechanisms built upon proven, NIST recommended and FIPS Approved algorithms to deter sniffing, replay and manipulation attempts that Bluetooth technology has been associated with. These mechanisms are regularly audited by independent security professionals.

    Q: Master Lock Safe Space Bluetooth Lock Box will not re-lock. What should I do?
    A: This can occur if the door pins of the lock box are left resting against the lock mechanism without being closed. This has fooled the lock into thinking it is closed completely.

    Press any button on the lock keypad and when the lock lights green, close the lock and it will light blue when locked.
    If using a code to open the lock box, enter the key code provided, when the lock lights green, close the lock and it will light blue when locked.

    Q: Where can I find the Master Lock Vault Enterprise app?
    A: The app is available in the Apple App Store and the Google Play Store. Click below or search for "Master Lock Vault Enterprise" in the app stores. There are two Master Lock Vault Apps, please make sure that you download the Enterprise version.

    Download on the App Store
    Android App on Google Play

    Q: Can the Master Lock Safe Space Portable and Wall-Mount Bluetooth Lock Boxes be used outdoors?
    A: Master Lock Safe Space Bluetooth Lock Boxes are designed to withstand outdoor environments.

    Q: Why do I need a Master Lock Vault account to register my lock box?
    A: A Master Lock Vault account ensures user credentials are securely deployed and provides enhanced functionality and convenience to the Master Lock Vault app.