Master Lock Bluetooth Portable Lock Box – Keyless App Access, Light-Up Keypad & Removable Shackle

Manage access to keys, key fobs and access cards without distributing physical copies. The Master Lock 5440ECR connects to the Master Lock Vault Home app for smartphone unlocking, shared access and activity monitoring. A light-up keypad provides code entry, while the removable shackle makes installation and relocation convenient.

Key Features

• Bluetooth-enabled keyless entry

• Unlocks through a compatible smartphone when in range

• Light-up keypad provides access-code entry

• Share temporary or permanent access

• Monitor who accessed the lock box and when

• Large interior accommodates keys, key fobs and access cards

• Fully removable shackle simplifies installation and relocation

• Durable metal lock body

• Weather-resistant construction for outdoor use

• Encrypted Bluetooth security

• Replaceable CR123A battery included

• Battery life of up to two years

• Low-battery alerts through the app and lock box

• External 9 V battery contacts provide temporary power if the internal battery dies

Specifications

• Brand: Master Lock

• Model: 5440ECR

• Product type: Portable Bluetooth key lock box

• Color: Black

• Lock body material: Metal

• Primary access: Master Lock Vault Home app

• Backup access: Light-up keypad

• External dimensions: 4-63/64" H × 3-15/64" W × 2-5/16" D

• Internal dimensions: 3-39/64" H × 2-1/2" W × 1-7/64" D

• Listed shackle dimension: 1-13/16" (46 mm)

• Shackle design: Fully removable

• Battery type: CR123A

• Estimated battery life: Up to two years

• Emergency power method: External 9 V battery

• Intended placement: Indoor or weather-exposed outdoor locations

• Water protection rating: Not specified

What’s Included

• 1 Master Lock 5440ECR Bluetooth portable lock box

• 1 Replaceable CR123A battery

A smartphone and 9 V emergency battery are not included.

Ideal For

• Residential key sharing

• Rental and vacation properties

• Family members and trusted neighbors

• Dog walkers and pet sitters

• Cleaning and maintenance services

• Storing vehicle keys or key fobs

• Managing access without making duplicate keys

Why It Stands Out

The Master Lock 5440ECR combines smartphone management with keypad access, allowing property owners to grant access without being physically present. Temporary and permanent permissions can be managed through the app, and the access history provides greater visibility than a conventional combination lock box.

Frequently Asked Questions

How is the lock box opened?
It can be opened with the Master Lock Vault Home app when a compatible smartphone is within range or by entering an authorized code on the keypad.

Does it require a physical key?
No. It is designed for keyless entry through Bluetooth or the keypad.

Can access be shared with other people?
Yes. The app allows the owner to provide temporary or permanent access to authorized users.

Can I see who opened the lock box?
The app supports access monitoring, allowing the owner to review who used the lock box and when.

What can fit inside?
The interior is designed for keys, key fobs and access cards. It measures approximately 3-39/64" H × 2-1/2" W × 1-7/64" D.

Is the lock box suitable for outdoor use?
It has a weather-resistant metal body intended for outdoor use. A specific waterproof or IP rating is not provided, so it should not be treated as fully waterproof.

What type of battery does it use?
It uses one replaceable CR123A battery, which is included.

How long does the battery last?
The battery can provide up to two years of operation, depending on usage and environmental conditions.

What happens when the battery is low?
Low-battery notifications appear through the app and on the lock box.

What if the battery dies while the box is locked?
A 9 V battery can be applied to the external contacts to provide temporary power for authorized access. The 9 V battery is not included.

Can the lock box be moved to another location?
Yes. The fully removable shackle makes it easier to install, remove and relocate.

Does it require Wi-Fi?
The lock box uses Bluetooth for nearby smartphone access. Any internet or account requirements for initial setup and remote app features should be confirmed in the current Master Lock Vault Home app instructions.