Master Lock 4400D

Bluetooth Padlock

Reviews (1) | Customer Questions (7)


Volume pricing applied in cart

In stock

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SKU: 4400D
  • Use your smartphone to open your lock
  • Never worry about a forgotten combination!
  • Share access with others – temporary or permanent
  • Share 24/7 access or limit to days or nights
  • Monitor access history & receive tamper alerts
  • Backup access using directional code on lock keypad
  • Low battery notification & reminder on padlock and in app
  • Comes with easy to replace CR2450 battery
  • Battery jump allows for temporary access if battery dies while locked
  • Locker Mode setting allows for access for a temporary user
  • Compact footprint fits most lockers
  • Hardened boron alloy shackle for superior cut resistance

Get the Master Lock Vault eLocks app – for iOSfor Android

Best Used For:

  • Indoor storage lockers
  • Cabinets
  • School, employee, or athletic lockers
GoKeyless™ is a factory trained and authorized Master Lock® dealer. Sales, service, support, valid warranties. It's why thousands of clients around the world choose GoKeyless™ for their security and access control needs each year. The most advanced combination lock ever created. The Master Lock Model No. 4400D bluetooth padlock is a portable combination padlock with a smartphone controlled locking system. Everything else in your life is connected, its time to get serious about your security. The smartphone app offers speed, ease of use, & greater control with the ability to share access; with keyless convenience. The locking mechanism features anti-shim technology, offering maximum security. The 1 Year Limited Warranty provides peace of mind from a brand you can trust. The model 4400D is made for indoor lockers. The dimensions are a perfect fit for standard lockers at schools, gyms, and clubhouses. Also available is the model 4401DLH which is great for outdoor usage.
Shackle Diameter

9/32in (7mm)

Shaft Material

Boron Carbide

Battery Type



Master Lock


Master Lock

Access Type

Combo, Smartphone

Wireless Protocol

Bluetooth BLE


1 Year Manufacturer

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5 out of 5 stars

1 review

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What others are saying

  1. Don't waste your money!

    Name Witheld

    While this product looks nice it is only for indoor use.
    The body of the lock is rather large and it can take a few tries to get it to unlock.
    The price is way too expensive for what you get.

    (0) (0)

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Customer Questions & Answers

  1. Q Can you set a timer to unlock at a certain time? answer now
    Asked by matthew mcdevitt on November 3, 2019 2:56 PM
    Answered by the admin

    Unfortunately, this lock model does not support any scheduling features. 

  2. Answered by the admin

    The app communicates with this lock using Bluetooth BLE technology from your smartphone, so your phone will need to be within the range of the lock to make changes. You can, however, share access with anyone who has access to a smartphone so that they can temporarily unlock the door using their phone.

  3. A

    No, it is only for a single user and that time frame is determined by the owner. 

  4. A

    While battery life is very dependent on usage, under average use it is about a one-year lifespan. As for temporary function, it is just that, a temporary code that you give to someone so they can gain access. 

  5. A If your phone needs to be in the locker then you can use the directional keypad on the lock to unlock the keypad. You would establish the sequence upon setup.
  6. A A single account can manage up to 250 padlocks. If you need more than that then we will need to get Master Lock involved to work on those user rights.
  7. Q Can this lock be used for exterior gates? Is it weather proof? answer now
    Asked by Mark on September 21, 2017 9:54 AM
    No, this is not designed for exterior use. However, you can use the 4401 version which is designed for exterior usage. 

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