---
product_id: 44772719
title: "Master Lock Key Lock Box with Code, Outdoor Lock Box for Realtors, Property Managers and Landlords, Ideal for Short-Term Rentals, Key Safe Holds 5 Keys, 5440EC"
brand: "master lock"
price: "S$146"
currency: SGD
in_stock: true
reviews_count: 11
category: "Master Lock"
url: https://www.desertcart.sg/products/44772719-master-lock-key-lock-box-with-code-outdoor-lock-box
store_origin: SG
region: Singapore
---

# App-controlled access & monitoring Bluetooth-enabled smart lock Weather-resistant to -40° Master Lock Key Lock Box with Code, Outdoor Lock Box for Realtors, Property Managers and Landlords, Ideal for Short-Term Rentals, Key Safe Holds 5 Keys, 5440EC

**Brand:** master lock
**Price:** S$146
**Availability:** ✅ In Stock

## Summary

> 🔐 Unlock smarter, not harder — your keys, your rules.

## Quick Answers

- **What is this?** Master Lock Key Lock Box with Code, Outdoor Lock Box for Realtors, Property Managers and Landlords, Ideal for Short-Term Rentals, Key Safe Holds 5 Keys, 5440EC by master lock
- **How much does it cost?** S$146 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/44772719-master-lock-key-lock-box-with-code-outdoor-lock-box)

## Best For

- master lock enthusiasts

## Why This Product

- Trusted master lock brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Brave the Elements:** Rugged metal body with weather resistance down to -40°, perfect for outdoor use.
- • **Real-Time Access Monitoring:** Receive instant tamper and low-battery alerts plus detailed usage logs for peace of mind.
- • **Smart Security at Your Fingertips:** Manage up to 10 locks and multiple users via the Master Lock Vault App—no Wi-Fi needed.
- • **Generous Capacity for Multiple Keys:** Spacious internal cavity holds up to 5 keys or key cards securely.
- • **Seamless Integration for Professionals:** Upgrade to Enterprise platform and sync with ShowingTime and BrokerBay for streamlined property management.

## Overview

The Master Lock 5440EC is a portable, Bluetooth-enabled lock box designed for realtors, property managers, and landlords. It offers secure, weather-resistant storage for up to 5 keys or key cards, controlled via a smartphone app that supports multiple users and real-time monitoring. Ideal for short-term rentals and remote properties, it integrates with professional scheduling platforms and features tamper alerts and easy battery replacement.

## Description

The Master Lock 5440EC Bluetooth Portable Lock Box. Open and manage with your smartphone or with temporary or permanent codes. Monitor who visits and when through the App and notifications. Removable shackle can be managed with the App or a traditional code. Large capacity to hold key cards or traditional keys. Long life battery is easily replaceable. Solid body durability and coated surface to protect hardware and door finish. Works with the free Master Lock Vault App. Use the App or web to track usage

Review: Great experience - Great product, very sturdy and safe, the app takes a bit of time to understand, but my wife is smarter than me, so no problem! Super convenient not to have to key codes, works really well. Thank you.
Review: Good Box that Seems to Work Well - I bought this key safe box for my 91 yo father who has lost his house keys twice in the last 2 months. I figured that putting a key in the box outside his door was the best way to ensure that he'd never lock himself out. From the moment I received the box, I was impressed with it. It is heavy and has Bluetooth connectivity that allows it to be programmed from the Master Lock app. Plus you can download access logs to see exactly who and when used it. It can allow for several (I think up to 5 or 7) different access codes that can be personalized and assigned to different people allowing each person their own code and the ability to use their own phone to unlock the box via Bluetooth. It has lots of customization options and works better than I expected. The lighted keypad is a easy to see; the buttons are big and sound a tone and blink when you push them; and the ability to create long or short PINs is a plus. It feels sturdy and I think it would keep whatever you put inside it safe. I do have a couple constructive comments though... First, to open it, you have to grab it from both sides and pull on the flared edges of the door which folds down to open it. Though not a big deal, this would seem kind hard for someone with grip issues. I assume it's built like this so you can't easily take a pry bar to the key safe, which I understand, but it also makes it a little harder to use for people with disabilities or the elderly... Or if it got wet, it might just be a little hard to open for a regular person if it got slippery. Maybe if the door popped open slightly when disarmed, that would be helpful and make opening the door a little easier. Lastly, I have more of an installation tip than a criticism... maybe a criticism of the directions. When you install the Master Lock app and assign phone privileges to the app, make sure that you set the privileges for the app to access your phone's Bluetooth all of the time, not just when the app is running. I know this sounds strange, but I had all sorts of connectivity issues with the app communicating with the box when the app only had privileges when the app was on. The app would recognize the box but it wouldn't update it consistently with the new passcodes. It would download the access log, but I sometimes had a problem unlocking the box using the app. The app would see the key safe, but didn't seem to stay connected to it. The BT connectivity was very shoddy until I changed the apps privileges. Once I did that, the app recognized the box consistently and worked as designed. Unfortunately, I don't remember seeing anything in the directions about this tidbit, and there's no troubleshooting section in the included fold out directions to help you. The directions are poor and basic at best and barely helped you through the install process. Maybe if I had known how to set the app's permissions from the directions, my comments would be different, but unfortunately, that tidbit of info isn't there and so it tainted my experience until I figured it out. It was so bad I even considered returning the key safe as defective. Luckily I installed the app on my Android phone and noticed the "allow use all the time" privilege that I didn't see as a choice so I didn't select it the first time I installed the app on my Dad's Android phone. (My Dad has a Motorola phone, and I have a Samsung). Once I went into the app's privileges and fixed it, all the issues I had went away. Needless to say, it's working now and I think it'll provide the security that my Dad needs.

## Features

- For indoor or outdoor use; portable lock box is best used for key and access card storage; large internal cavity allows secure storage for multiple keys; weather resistant to -40°. Schedule access now or in the future.
- Share temporary or permanent access via Bluetooth or keypad code with invited guests (Wi-Fi connection is not required to operate); Monitor activity, and receive tamper and low-battery alerts
- Ideal for use on Airbnb and VRBO vacation rental properties, unmanned remote locations, and real estate
- Master Lock Vault Home and Enterprise Apps are designed for personal use, supporting up to 10 locks. Can be upgraded to Master Lock Vault Enterprise business platform, and integrated with ShowingTime and BrokerBay scheduling management
- 3-1/4 in. wide lock body, 13/32 in. diameter shackle with 1-13/16 in. length, 1-13/32 in. width; Internal dimensions 3-39/64 in. height, 2-1/2 in. width, 1-7/64 in. depth; Replaceable CR123A battery (included); Lock box is not intended to securely fit key fobs inside
- For answers to frequently asked questions, troubleshooting, and technical support, see document titled User Guide in the technical specifications section of this page
- Comes with easy to replace CR123A battery

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B071VGZ283 |
| Batteries | 1 CR123A batteries required. (included) |
| Batteries Included? | Yes |
| Batteries Required? | Yes |
| Battery Cell Type | Lithium |
| Best Sellers Rank | #13,716 in Office Products ( See Top 100 in Office Products ) #38 in Security Lock Boxes |
| Brand | Master Lock |
| Color | Silver & Black |
| Connectivity Protocol | Bluetooth, Wi-Fi |
| Control Method | App |
| Controller Type | Vera |
| Customer Reviews | 4.2 4.2 out of 5 stars (1,593) |
| Date First Available | May 6, 2017 |
| Finish | Metal |
| Finish Type | Metal |
| Global Trade Identification Number | 00071649293009 |
| Included Components | Lock box |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 1.1 pounds |
| Item dimensions L x W x H | 1.13 x 3.25 x 4.8 inches |
| Item model number | 5440D |
| Lock Type | Electronic |
| Manufacturer | Master Lock |
| Material | Metal |
| Model Name | 5440EC |
| Mounting Type | Portable |
| Number of Pieces | 1 |
| Part Number | 5440EC |
| Pattern | Box |
| Product Dimensions | 1.13 x 3.25 x 4.8 inches |
| Recommended Uses For Product | Vacation rental properties, unmanned remote locations, real estate, and business applications with multiple locks and users |
| Shape | rectangular prism |
| Size | 3-1/4" |
| Special Feature | Portable |
| Special Features | Portable |
| Style | Portable |
| UPC | 071649293009 |
| Warranty Description | Limited One Year Warranty |

## Product Details

- **Brand:** Master Lock
- **Item dimensions L x W x H:** 1.13 x 3.25 x 4.8 inches
- **Lock Type:** Electronic
- **Material:** Metal
- **Special Feature:** Portable

## Images

![Master Lock Key Lock Box with Code, Outdoor Lock Box for Realtors, Property Managers and Landlords, Ideal for Short-Term Rentals, Key Safe Holds 5 Keys, 5440EC - Image 1](https://m.media-amazon.com/images/I/51O7QzFcuaL.jpg)
![Master Lock Key Lock Box with Code, Outdoor Lock Box for Realtors, Property Managers and Landlords, Ideal for Short-Term Rentals, Key Safe Holds 5 Keys, 5440EC - Image 2](https://m.media-amazon.com/images/I/71dYkDx86ZL.jpg)
![Master Lock Key Lock Box with Code, Outdoor Lock Box for Realtors, Property Managers and Landlords, Ideal for Short-Term Rentals, Key Safe Holds 5 Keys, 5440EC - Image 3](https://m.media-amazon.com/images/I/71jsCf08CAL.jpg)
![Master Lock Key Lock Box with Code, Outdoor Lock Box for Realtors, Property Managers and Landlords, Ideal for Short-Term Rentals, Key Safe Holds 5 Keys, 5440EC - Image 4](https://m.media-amazon.com/images/I/61ggdOFboLL.jpg)
![Master Lock Key Lock Box with Code, Outdoor Lock Box for Realtors, Property Managers and Landlords, Ideal for Short-Term Rentals, Key Safe Holds 5 Keys, 5440EC - Image 5](https://m.media-amazon.com/images/I/61IbUDbwJAL.jpg)

## Available Options

This product comes in different **Pattern, Style** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great experience
*by O***E on November 20, 2025*

Great product, very sturdy and safe, the app takes a bit of time to understand, but my wife is smarter than me, so no problem! Super convenient not to have to key codes, works really well. Thank you.

### ⭐⭐⭐⭐⭐ Good Box that Seems to Work Well
*by E***E on April 13, 2021*

I bought this key safe box for my 91 yo father who has lost his house keys twice in the last 2 months. I figured that putting a key in the box outside his door was the best way to ensure that he'd never lock himself out. From the moment I received the box, I was impressed with it. It is heavy and has Bluetooth connectivity that allows it to be programmed from the Master Lock app. Plus you can download access logs to see exactly who and when used it. It can allow for several (I think up to 5 or 7) different access codes that can be personalized and assigned to different people allowing each person their own code and the ability to use their own phone to unlock the box via Bluetooth. It has lots of customization options and works better than I expected. The lighted keypad is a easy to see; the buttons are big and sound a tone and blink when you push them; and the ability to create long or short PINs is a plus. It feels sturdy and I think it would keep whatever you put inside it safe. I do have a couple constructive comments though... First, to open it, you have to grab it from both sides and pull on the flared edges of the door which folds down to open it. Though not a big deal, this would seem kind hard for someone with grip issues. I assume it's built like this so you can't easily take a pry bar to the key safe, which I understand, but it also makes it a little harder to use for people with disabilities or the elderly... Or if it got wet, it might just be a little hard to open for a regular person if it got slippery. Maybe if the door popped open slightly when disarmed, that would be helpful and make opening the door a little easier. Lastly, I have more of an installation tip than a criticism... maybe a criticism of the directions. When you install the Master Lock app and assign phone privileges to the app, make sure that you set the privileges for the app to access your phone's Bluetooth all of the time, not just when the app is running. I know this sounds strange, but I had all sorts of connectivity issues with the app communicating with the box when the app only had privileges when the app was on. The app would recognize the box but it wouldn't update it consistently with the new passcodes. It would download the access log, but I sometimes had a problem unlocking the box using the app. The app would see the key safe, but didn't seem to stay connected to it. The BT connectivity was very shoddy until I changed the apps privileges. Once I did that, the app recognized the box consistently and worked as designed. Unfortunately, I don't remember seeing anything in the directions about this tidbit, and there's no troubleshooting section in the included fold out directions to help you. The directions are poor and basic at best and barely helped you through the install process. Maybe if I had known how to set the app's permissions from the directions, my comments would be different, but unfortunately, that tidbit of info isn't there and so it tainted my experience until I figured it out. It was so bad I even considered returning the key safe as defective. Luckily I installed the app on my Android phone and noticed the "allow use all the time" privilege that I didn't see as a choice so I didn't select it the first time I installed the app on my Dad's Android phone. (My Dad has a Motorola phone, and I have a Samsung). Once I went into the app's privileges and fixed it, all the issues I had went away. Needless to say, it's working now and I think it'll provide the security that my Dad needs.

### ⭐⭐⭐⭐⭐ Works Flawlessly!
*by A***Y on February 18, 2026*

We use this to hand out a key to a gated cave. Has worked flawlessly for 6 months on a single battery. Would highly recommend this product to someone who effectively needs to send out unique lockbox codes but does not have wifi available. Essentially the codes "exist" on this device always. The app on your phone just tells you what the code is for any given day/time. I believe the code is valid for 4 hour blocks of time. Very clever design.

## Frequently Bought Together

- Master Lock Key Lock Box with Code, Outdoor Lock Box for Realtors, Property Managers and Landlords, Ideal for Short-Term Rentals, Key Safe Holds 5 Keys, 5440EC
- Master Lock 5490D Retractable Lock Box Key Tether Small
- Master Lock Key Lock Box, Outdoor Lock Box for House Keys, Key Safe with Combination Lock, 5 Key Capacity, 5400EC, Black

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.sg/products/44772719-master-lock-key-lock-box-with-code-outdoor-lock-box](https://www.desertcart.sg/products/44772719-master-lock-key-lock-box-with-code-outdoor-lock-box)

---

*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-03-13*