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Master Lock

Master Lock Padlock, Indoor Personal Use Bluetooth Lock, 1-29/32 in. Wide, 4400D

    • Based on 324 reviews
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Style: Indoor


Size: 1 Pack


Features

  • For indoor use; compact design is best used for school, employee, athletic, and indoor storage lockers
  • Use your smartphone to unlock Bluetooth padlock, or enter directional code on lock keypad for easy backup entry when your smartphone isn't present; Disabled mode setting allows for smartphone storage inside a locker (Wi-Fi connection is not required to operate)
  • Share temporary or permanent access via Bluetooth or keypad code with invited guests, monitor activity, and receive tamper and low-battery alerts all from your free Master Lock Vault Home app for Android and iOS. Designed for personal use, supporting up to 10 locks
  • Padlock includes metal body construction, boron carbide shackle, and anti-shim locking mechanism for improved strength and security; Plus military-grade Bluetooth authentication and encryption
  • 1-29/32 in. wide lock body; 9/32 in. diameter shackle with 7/8 in. length, 13/16 in. width

Description

Master Lock Padlock, Indoor Personal Use Bluetooth Lock, 1-29/32 in. Wide, 4400D

Brand: Master Lock


Special Feature: Keyless


Lock Type: Keypad


Item dimensions L x W x H: 3.06 x 2 x 1.1 inches


Material: Metal


Brand: ‎Master Lock


Special Feature: ‎Keyless


Lock Type: ‎Keypad


Item dimensions L x W x H: ‎3.06 x 2 x 1.1 inches


Material: ‎Metal


Recommended Uses For Product: ‎Security


Style: ‎Indoor


Color: ‎Silver and Black


Finish Type: ‎Polished


Included Components: ‎Master Lock - 4400EC


Controller Type: ‎Vera, iOS, Android


Shape: ‎Rectangular


Item Weight: ‎0.51 Pounds


Control Method: ‎App


Connectivity Protocol: ‎Bluetooth, Wi-Fi


UPC: ‎071649266591


Global Trade Identification Number: ‎91


Manufacturer: ‎Master Lock Store


Part Number: ‎Master Lock - 4400EC


Item Weight: ‎8.1 ounces


Product Dimensions: ‎3.06 x 2 x 1.1 inches


Item model number: ‎Master Lock - 4400EC


Batteries: ‎1 Lithium Metal batteries required. (included)


Is Discontinued By Manufacturer: ‎No


Size: ‎1 Pack


Finish: ‎Polished


Item Package Quantity: ‎1


Number Of Pieces: ‎1


Special Features: ‎Keyless


Batteries Included?: ‎Yes


Batteries Required?: ‎No


Battery Cell Type: ‎Lithium Manganese Dioxide


Warranty Description: ‎Limited 1 Year Warranty


Date First Available: January 4, 2016


Frequently asked questions

This product is currently out of stock. Please check back later for shipping info.

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • Modern interpretation of a gym locker padlock
An excellent lock from a name I trust. It's not laden with features (it is, after all, only a padlock), but it is a solid performer. Works as advertised, has no problems functioning in a steamy gym locker room environment. Unfortunately, I pretty much use this padlock exclusively in Locker mode since I have it on my gym locker. That means I am always entering the code on the dial instead of benefiting from the Bluetooth proximity activation feature (since my phone is always in my locker when I use this lock). That said, it does it's job well and has given me no problems or issues at all. One small bug: if you close and then quickly open the lock again before the lock's mechanism clicks, it will remain unlocked. Even if you close it, it will still be openable. The only way to make it lock properly again is to enter the code on the front of the lock (like you are unlocking it), and let the lock unlock. Then lock it again and do not attempt to open it until after the mechanism clicks. I can repeat this behavior, so it does seem to be some kind of bug, but at least it is easy to resolve without any complex steps to follow. ... show more
Reviewed in the United States on June 11, 2017 by Mitchell F
    • Trade off’s still make this a good lock overall.
Pretty good lock. My only gripe is the app. Not as reliable as it could be. And be prepared for frustration when your iPhone updates its firmware and renders the Masterlock App unusable until Masterlock does its own update. Make a copy of your manual passcodes and store them on your preferred device in those rare instances that the Masterlock App will not work. At least you’ll be able to get the lock to open and get on with your day. Other than that, it’s made a huge difference getting in and out of my locker at work and not having to search around for lost/missing keys. Almost everyone these days has that one thing that life dictates is a must carry and that’s the cell phone. Perfect but for a few app snags every now and then. ... show more
Reviewed in the United States on December 8, 2019 by Frank J. Estrada
    • Get one
Product works great. Sturdy construction and the apps cool. not sure how long my product sat around because my battery died quick. Found a replacement for 6 bucks at Kroger. Issue started off with no code to unlock it. Looks like someone took it. I contacted Masterlock and they other me my code within 24 hours. I'd recommend this product. ... show more
Reviewed in the United States on March 14, 2017 by Jim
    • Save your money and don't buy this.
This is the first review I've written on Amazon, but after the worst 3 days with a product, I had to review it. I received this on Monday 6-19. I downloaded the associated app, registered with the app and I thought all would be well. After reviewing the instructions it was a simple press of the center button once you register the product to use the app with the lock. But for some reason it was not working. After an hour of consulting the "user guide" and master lock's support website I was still unable to unlock the lock and remove it from the packaging. Finally I decide to remove the battery and try to "jump" the lock. This is a backup option that is available. But this option would not work either. Finally I decide to try another battery that I have at home and low and behold it works. So I got the lock with a preinstalled battery that was dead. So the following morning (Tuesday 6-20) I go and purchase a brand new battery to put in the lock as I don't want to use the one around the house incase it's almost dead. I proceed to use the lock Tuesday night at Planet Fitness and all works fine. Now comes today (Wednesday 6-21), I go to the gym and unlock my lock to put on the locker. After a 2 hour session at the gym, I go in to get my bag, keys, wallet, etc. and I can not open the lock. I press the center button and get nothing. I try the primary dial code and nothing. I pull the battery out to try the jump option and nothing. So I had to go to the front desk and ask them to cut the lock off of my locker because I had no way to get home, or buy another battery. This lock killed a brand new battery in less than 48 hours. So now I am out the cost of this lock because it truly is garbage. I wish I could leave a half star rating because the only good part was for the one day I actually got it to work, it did perform exactly as it should have. ... show more
Reviewed in the United States on June 22, 2017 by Alan B.
    • Complicated, over cooked mobile exp. is a big letdown.
Review Image by Sir Over Here the II Sir Over Here the II
Review Image by Sir Over Here the II Sir Over Here the II
Review Image by Sir Over Here the II Sir Over Here the II
Id love to give this lock a little more love. The lock is sturdy. The Bluetooth sync works great. The problem is the UX. It is so complex. I spend 10 mins at the gym trying to make it lock. One time I thought it was locked, but it wasn't. How hard is it to have an app that has a locked image on it, you hit a button and it unlocks and shows that on the display. Too many features and different user paths, worrying about web based profiles and locker mode - they forgot the basic principle. I wish I'd bought another brand and currently force myself to use it over a traditional lock just coz I spent $$ on it. Design your app like Apple did the iPod. One button that clearly makes it lock and unlock. Forget the other stuff for now. ... show more
Reviewed in the United States on April 22, 2016 by Sir Over Here the II Sir Over Here the II
    • Good padlock with a really bad app.
This Smart Padlock from Master Lock is innovative and allows for sharing of virtual keys. That functionality is very convenient, and so far the lock itself has performed flawlessly. I am less impressed with the app you need to run this lock. I know of several times when it has not updated the history of usage to my phone when accessed by other people. That's really bad: access management was one of the reasons I bought it. The other is that the app is really poorly designed. The interface looks outdated and is confusing to use, and the instructions in the box actually point you to download the wrong app for it. The lock app has been frustrating for a power user: I cannot imagine if a novice was using it. Overall, I would say the lock is a winner, the app is a loser, and MasterLock should rewrite the app from the ground up, making it simple and easy to use. ... show more
Reviewed in the United States on August 1, 2016 by MrSteveee
    • Great lock, but perhaps not for the mentally challenged
I now have two of these locks. They work great, especially when you take the time to read and comprehend. The support is great as well, therefore, if you're having issues, it's a great idea to contact support as they are patient and know the product well; and will guide you through resolving issue. Once agent had me reference the document that came with the lock and pointed me to the information to resolve the issue, which let me know realize, most issues, you already have the information, if you just take a look at it. It will prevent a call to support and help you to learn the product. ... show more
Reviewed in the United States on December 21, 2021 by TL Green

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