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Master Lock Bluetooth Smart Padlocks put control in the palm of your hand, so you can protect what matters most in your life. Unlock your lock, share access with guests, and monitor activity - all with one easy-to-use app.


Get lost, lost keys - and forget combos for good. With this Bluetooth Smart padlock, your phone is your key.


Whether you have your phone or not, you're always in control. Have your phone? Touch any button on the lock and open it. Phone not available? Just enter the directional code on your lock keypad.


Easily manage your workforce's access to key areas and keep an effortless log of employee entry that you can bring up anytime, anywhere.


The app is available in the Apple App Store and the Google Play Store. Click below or search for "Master Lock Vault eLocks" in the app stores.

Download on the Apple App Store Android App on Google Play


How long will the 4400 series battery last?
The 4400 series battery should last at least 2 years in Touch Unlock Mode and 4 months in Swipe Unlock Mode with regular use.
How long will the 4401 series battery last?
The 4401 series battery should last 5 years in Touch Unlock Mode and 2 years in Swipe Unlock Mode with regular use.
What if my phone is lost or stolen?

Reset Keys allows the lock Owner to revoke all Bluetooth access to the lock, including their own. The Owner and all guests will receive updated Bluetooth credentials on their mobile devices.

LOST / STOLEN DEVICE NOTE! The owner of a lost or stolen mobile device should first go to the MasterLockVault.com web site and change their username and passcode.

To Reset Keys, the lock Owner should:

  1. Select the lock from the Locks list.
  2. Touch MANAGE LOCK in the upper right corner. Enter your passcode, if prompted.
  3. Touch the SETTINGS icon Settings Icon in the upper right corner.
  4. Touch RESET KEYS.
  5. Follow any additional instructions in the app to save the changes to your lock. This step must be completed for each lock the lost or stolen device had access to.
What if my lock battery dies?
If the lock battery dies while the lock is closed, it can be unlocked using an external battery.

When the battery has less than 20% of estimated life remaining:

  1. The center LED on the lock keypad will light yellow.
  2. An email notification will be sent to the lock owner.
  3. A Low Battery icon will appear in the app.
  4. A Low Battery warning will appear in the lock's history.

To replace the battery on the 4400 series:

  1. The center LED on the lock keypad will light yellow to indicate low battery.
  2. Unlock and open the lock.
  3. Pull out the battery drawer at the bottom of the lock and remove the old battery*.
  4. Install a new CR2450 battery with the positive (+) side facing the back of the lock.
  5. Close the battery drawer.
    * The battery drawer will only fully extend when the lock is in the open position.
Replace Battery On 4400 Series

To replace the battery on the 4401 series:

  1. The center LED on the lock keypad will light yellow to indicate low battery.
  2. Unlock and open the lock.
  3. With the back of the lock facing you, pull the bottom cover down to remove it.
  4. Use a coin to turn the slot in the battery door 90 degrees counter clockwise. *Open the battery door & remove the old battery.
  5. Install a new CR2 battery with the positive (+) side facing to the right.
  6. Close the battery drawer, turn the slot back 90 degrees clockwise & replace the bottom cover..
    * The slot in the battery door will only turn when the lock is in the open position.

Replace Battery On 4401 Series

Additional Information

Technical Data

Bluetooth Smart Padlock

  • Your smartphone is the key to your padlock - no more lost keys or forgotten combos!
  • With free app, enjoy speed & ease of use, share access, have greater control with temporary digital keys/codes
  • Receive tamper alerts & low battery notifications
  • Replaceable CR2 battery can be jumped with an external battery if the battery dies in the locked position
  • Backup access using an up/down/left/right directional code on the lock keypad
  • Easily add/remove guests & schedule guest access to 24/7 or limit to days or nights
  • Locker Mode allows for maintaining a locked state while the phone is stored inside of a locker
  • Lock history log tracks important lock events
  • Hardened boron alloy shackle for superior cut resistance
  • 2.2" (56mm) wide metal lock body with weather cover
  • Shackle diameter .36" (9mm); shackle clearance: 2" (51mm) high, 15/16" (23mm) wide
  • Designed for outdoor applications with a 2-piece injection molded cover & shackle seals for resistance to weather and dry contaminants
Manufacturer Master Lock