Xiaomi keychain: what it is, why it is needed and how it works in the Mi ecosystem

When it comes to Xiaomi key fobs, many people think of a common key for cars or bags. But in fact, the term in the Mi ecosystem hides a whole line of compact devices — from smart trackers to remote controls for technology — these gadgets have become an integral part of the smart home and everyday life of users, offering features that go far beyond the classic key fob.

In this article, we will take a closer look at what Xiaomi key fobs are, what kinds exist (such as Mi Smart Key, Mi Band in key fob format or MiJia Bluetooth Remote), how they integrate with other devices of the brand and what you need to know before buying.

If you’ve ever lost your keys, forgotten to turn off your lights, or wanted to remotely start a robot vacuum cleaner, this article will help you understand how Xiaomi key fobs can solve these problems. And for those who already use Mi Home or Mi Smart Band, we’ll reveal the hidden capabilities of these miniature assistants.

What is Xiaomi key fob: definition and basic types

The term “Xiaomi key fob” combines several types of devices that look like a classic key fob, but perform much broader functions, all of which belong to the category of wearable gadgets or accessories for the smart home and work in conjunction with the Mi Home, Mi Fit or Xiaomi Wear applications.

The main types of key fobs from Xiaomi:

• 🔑 Smart keys (such as Mi Smart Key) – for remote control of locks, alarms or equipment through the use of a device Bluetooth/NFC.
• 📍 Trackers (e.g. Mi Band in keychain format or MiJia Bluetooth Tag) – to track the location of things (keys, bags, animals).
• 🎛️ Control panels (for example, MiJia Bluetooth Remote) – for controlling a smart home (light, robot vacuum cleaner, air conditioning).
• 🔋 Battery-powered key fobs (e.g. Mi Power Bank Mini) – compact powerbank for emergency charging.

It's important to understand that not all of these devices are positioned as "foams" in the classical sense. For example, the Mi Band 8 can be used in the format of a key fob thanks to a removable module, but its main function is a fitness tracker. But the MiJia Bluetooth Tag is a key fob that is attached to the keys and helps to find them through a smartphone.

All of these gadgets share a compactness, low power consumption and integration with the Xiaomi ecosystem, but their functionality and compatibility are very different, more details will be found in the next section.

Xiaomi key fob functions: from key search to home management

Xiaomi key fobs are model-specific, but most of them are designed to solve one of three key tasks: tracking, control or automation.

1.Searching for lost things

Trackers (such as MiJia Bluetooth Tag or Mi Smart Band in key fob mode) work on the principle of Bluetooth. LE. They connect to the smartphone and allow:

• 🔔 Sound signal – if the key fob is in range (up to 50 m), you can make it squeak through the application.
• 📍 Map display is the last known location (if the fob is out of range of Bluetooth).
• 🔄 Reverse search – pressing the key fob makes the smartphone squeak (useful if you lost your phone at home).

2.Managing a smart home

Remote fobs (such as MiJia Bluetooth Remote) allow you to run Mi Home scripts with a single click.

• 💡 Turn on/off the lights on schedule.
• 🤖 Launch the Mi Robot Vacuum Robot Vacuum in Cleanup.
• ❄️ Set the temperature on the air conditioner Mi Air Conditioner.

3. Remote control of equipment

Some key fobs (such as Mi Smart Key) are equipped with NFC or an infrared port and can:

• 🚗 Opening of the car locks (if supported).
• 🔐 Unlock the Xiaomi Mi Smart Door Lock.
• 📺 Control the TV or air conditioning through the IR port.

Importantly, not all features are available in all models, like the MiJia Bluetooth Tag doesn't know how to control the hardware, it only tracks location, and the Mi Smart Key is not suitable for finding things, but it can open doors, so you need to be clear about what the key fob should be doing before you buy it.

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Xiaomi key fobs are divided into three main categories according to functionality: trackers (search for things), remotes (house management) and keys (remote lock opening).

Compatibility of Xiaomi key fobs with other devices

One of the key benefits of Xiaomi key fobs is their integration into a single ecosystem, but not all models are compatible with all devices. Below is a table of compatibility of popular fobs with Mi Home technology:

• 📱 Most key fobs require the Mi Home app to be installed (available for Android and iOS, but some features on iPhone may be limited).
• 🔄 To work smart home scenarios, the keychain and the managed device must be on the same Wi-Fi network.
• 🔒 Mi Smart Key with NFC It only works with supported Xiaomi locks (see official directory for the list).

Critical feature: Xiaomi key fobs with Bluetooth 5.0 (for example, MiJia Bluetooth Tag 2) have an increased range (up to 100 m in open space), but in a city with interference, the real range rarely exceeds 30-40 m.

⚠️ Warning: If you use a key fob to control your smart home via Mi Home, make sure your smartphone and key fob are tied to the same Mi Account.

How to set up a key fob Xiaomi: step-by-step instructions

The setup process depends on the type of fob, but the general scheme looks like this:

Installation of the annex

Download Mi Home (for remotes and keys) or Mi Fit (for trackers like Mi Band) from the App Store or Google Play. Sign up or sign in to your Mi Account.

Addition of a device

Open the application and click "Add device" (icon"+" in the upper right corner. Select a category:

• For trackers: “Wearable devices" →"MiJia Bluetooth Tag".
• For remotes: Smart home" →"MiJia Bluetooth Remote".
• For keys: “Security" →"Mi Smart Key".

3. Connection and setup

Follow the instructions on the screen. You usually need to:

Turn on Bluetooth on your smartphone

Place the key fob next to the phone (no more than 10 cm)

Confirm the conjugation in the annex

Update the firmware of the key fob (if available)

Tie the key fob to your Mi Account-->

For MiJia Bluetooth Remote, you need to configure scripts, for example:

1. Go to Profile. → Automation → Scripts.
2. Click Add and select Device → MiJia Bluetooth Remote".
3. Tie the key fob button to action (for example, turning on the Mi lamp). LED Desk Lamp).

Verification of work

Test the main functions:

• For trackers: Step 10-15m away and check if a notice of loss of communication appears.
• For remotes: Press the button and make sure the script works (e.g., the lights go on).
• For keys: Bring the key fob to the lock and check the unlock.

⚠️ Note: If the MiJia Bluetooth Tag key fob is not determined by the app, try removing and inserting the battery back (usually this is the case). CR2032). Also make sure that your smartphone is enabled Bluetooth 4.0+ geolocation (necessary for map search).

Xiaomi's Popular Floor Chains: Comparison and Prices (2026)

More than 10 key fob models from Xiaomi and its sub-brands (MiJia, Redmi, Aqara) are on the market, and the following is a comparison of the most popular options as of 2026:

• 💰 If you need a simple key tracker, MiJia Bluetooth Tag 2 is the best choice for price/quality.
• 🏠 To manage a smart home, it is better to take MiJia Bluetooth Remote or Aqara Smart Button (the latter has more options for setting buttons).
• 🔐 If you need to open doors, look for the Mi Smart Key, but check for compatibility with your lock.

An important nuance: Xiaomi key fobs are often sold under different brands (MiJia, Aqara, Yeelight), but they all work in the Mi Home ecosystem.

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Before buying, check if the fob supports your version of the Mi Home.For example, older MiJia Bluetooth Tag models may not work with the latest app updates.

Frequent problems with Xiaomi key fobs and how to solve them

Even the most reliable devices sometimes fail, and here are the typical problems and ways to fix them:

1.The key fob doesn't connect to the phone

Causes and solutions:

• 📱 Bluetooth is off – turn it on in your smartphone settings.
• 🔋 Replace the battery with a new one (usually) CR2032).
• 🔄 Sync failure – remove the key fob from the application and add again.
• 📲 Outdated firmware - update the Mi Home app and key fob firmware.

2.The tracker key fob doesn't show location

What to do:

• 📍 Make sure your smartphone has geolocation enabled (on Android: Settings) → Location).
• 🌐 Check your Internet connection – without it, the map in Mi Home is not updated.
• 🔍 If the key fob has not been in Bluetooth range for a long time, its location may not be updated. Try to find it manually (sound signal).

3. The remote buttons are not working

Possible causes:

• 🔌 The keychain is not tied to the script - check the settings in Mi Home.
• 📶 Weak Bluetooth signal – bring the key fob closer to the phone or router (if you use Mi Home Gateway).
• 🔧 In-app crash – restart Mi Home or reinstall it.

4. NFC-keychain doesn't open the lock

Decisions:

• 🔐 Make sure the lock supports your key fob model (see the manufacturer’s website for compatibility list).
• 📱 Check if it's on. NFC on a smartphone (on Android: Settings) → Connections → NFC).
• 🔄 Reboot the lock (usually the Reset button on the back panel).

⚠️ Warning: If the MiJia Bluetooth Tag has stopped working after the battery is replaced, try resetting it to factory settings. To do this, press the button for 10 seconds (before the indicator blinks).

Where to buy a Xiaomi keychain and how to avoid fakes

Xiaomi key fobs are sold in official and unofficial stores, but the risk of running into a fake is quite high.

Official sources (quality guarantee):

• 🌍 Xiaomi official website (international version).
• 🛒 AliExpress (stores with a rating above 98% and reviews in Russian).
• 🏬 Official retailers: Svyaznoy, M. Video, Citilink (check the availability of the certificate).

Signs of forgery:

• 🔍 There is no hologram of Xiaomi on the package.
• 📦 The box is made of thin cardboard, without a corporate design.
• 🔋 Battery does not hold charge (original key fobs run on a single battery for months).
• 📱 Not connected to the Mi Home application (Error "Device not supported").

Buying tips:

• 💬 Read the reviews 4PDA or MIUI Su – there are often discussed problems with counterfeiting.
• 🛡️ Check it out. IMEI or serial number on the Xiaomi Verify website.
• 💰 Compare prices: if the key fob costs 30-50% cheaper than the average market price, this is a reason to be wary.

• 📦 Complete with the original key fob must be instruction in Chinese/English and branded cable (if provided).
• 🔄 If you buy from AliExpress, choose sellers labeled “Official Store” or “Top Brand".

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Buy Xiaomi key fobs only from trusted sellers. Counterfeiting not only works poorly, but can also pose a danger (such as uncertified batteries).

FAQ: Answers to Frequent Questions About Xiaomi