Review: Xiaomi Mijia Honeywell Smart Fire Detector


Today I will review the Mijia Honeywell Smart Smoke Detector (does not detect Carbon Monoxide) which I bought for 20,61 euro. So it was not only created by Xiaomi/Mijia, but in combination with Honeywell (well known for their the automation- and control systems).

The name Xiaomi has been showing up more and more when talking about IoT, especially when talking about affordable IoT. In march 2016 Xiaomi created a company dedicated to ‘smart home’ products, this company was called Mijia (Chinese for ‘Smart home’). Xiaomi is mostly focused on the Chinese market but has been slowly expanding to Europe (mostly phones). They are very good at combining a well-rounded product with good design for an insanely low price, but one of the main disadvantages is that the products are (almost) only available in China but can be imported via various sites like Gearbest.


Weight Product weight: 0.1000 kg
Package weight: 0.1700 kg
Dimensions Product size (L x W x H): 9.00 x 3.60 x 2.50 cm / 3.54 x 1.42 x 0.98 inches
Package size (L x W x H): 12.00 x 5.00 x 3.50 cm / 4.72 x 1.97 x 1.38 inches
Package Contents 1 x Fire Alarm Detector
1 x Chinese Manual (Click here for English manual)
1 x Mount Plate
2 x Screw
2 x Wall Plug
2 x Double Sided Sticker
Powered by CR123A Cell Battery 3.0V (NOT INCLUDED)
  • Remote Alert (get a notification on your phone)
  • CCCF Certification
  • Zigbee Wireless Technology
  • Progressive Sound Alarm (will get louder with every beep up to 80 dB)
  • Periodic Self-inspection Reminder
  • Anti-flame materials
  • 5 years or more lifespan
  • Configurable sensitivity
  • Compatible with SmartThings
Manual Link


If you have bought Xiaomi/Mijia products before, this little box won’t surprise you. The box is the same as every other Xiaomi product with a slight Apple feel to it. The box’s design is very minimal and clean, with the product on front and white as primary color.

The box is quite small and has a picture of the smoke detector on the front
On the top you have a Mijia icon and under that the Honeywell icon. On the back you have product information but that’s in Chinese.
The smoke detector is packed in a small box without any filling, the product itself is really sturdy so it should not be damaged easily in shipping.

They did not only include two screws with plugs, but also double sided stickers. This way you can mount it to your liking (beware, the Xiaomi stickers are like superglue)


Just like the box, Xiaomi likes to keep it clean and white
It definitely looks better than your average smoke detector, I think Xiaomi always hits the nail on the head for design.
On the back there is some product information, but to no one’s surprise it is all in Chinese.

Hardware & Software

Smart Features

The smoke detector has multiple ‘smart’ features, but if you don’t pair it to the gateway it’s just your average dumb smoke detector. I will you how to connect it to the Gateway in the following paragraph.

Remote alert

When the smoke detector gets triggered it willll send you a notification via the Mi Home App, even outside your home. Because of this you’ll be able to get to the starting fire faster and prevent it from burning your whole house down.

Self Testing

You can ‘self test’ the device in the Mi-Home app. This will send a self-check request to the device, after which a screen will show up asking you “Did you hear the sound?”. If you did hear it, your device is functioning normally! If you didn’t hear anything, it is probably because the distance between your gateway and the smoke detector is too far. If you want you can enable monthly reminder. The Mi-Home app will send you a notification that it is time for the monthly test and it will execute the self-test.

Set Trigger Sensivity

If you have a smoke detector close to the fireplace, the trigger threshold would need to be turned down a bit so it won’t go off every time you lit your fireplace. Same story for a smoke detector in the kitchen, you don’t want it going off every time you cook something. You can adjust the sensitivity by change the installation site, this way you can adjust it to the room. You have the three following options:

  1. No smoke area (e.g. office, warehouse),
  2. Small amount of smoke area (default)
  3. Above normal amount of smoke (e.g. kitchen or close to the fireplace).

Tandem Mode

While this is not the most exciting ‘smart’ feature, the ability to tandem your smoke detector with your gateway is not to be forgotten. My house is three stories and let’s say my smoke detector at the bottom of my house gets triggered, it’ll be hard for me to hear it upstairs (image if I am sleeping or showering!). That’s why pairing it with your gateway is a nice solution for this. This way I’ll be able to hear it upstairs, even though the alarm is downstairs.


If you want more than just a ‘dumb’ smoke detector, you can pair it to your gateway. This can be done via the Mi Home app, available on the Play store and the App store. The app is mostly English but some parts are still Chinese, it is still very usable though. The pairing process is quite easy, the gallery under here will guide you through it (enable information for instructions!).

You can add the device by click the + in the top right.
« 1 of 7 »

After that you have unlocked the smart features! If you click on the smoke detector you will be able to edit things like installation site or enable tandem mode.

Tips ‘n Tricks

Disabling the alarm when it gets triggered

If the smoke detector get’s triggered, you will have to disable the alarm by click the Sound stop/Self check button, you can find this on the front of the device. After you have clicked this button the alarm and light will immediately stop, but the device will also disable itself for 70 seconds.

What can trigger the alarm?

The following can trigger the alarm:

  • Hair or insect spray (directly on the device).
  • Cigarette smoke or other incendiary substances.
  • Smoke from e-cigarettes or alike devices.
  • Smoke or steam from cooking.
  • Condensation on the device (so do not install it outdoors or in bathrooms).

Simulation mode

If you want to test the sound of the device, you can simulate it going off (without actually burning something). This can be done by holding the button for 3 seconds. The light will begin to flash and the alarm will go off progressively, this means it’ll get louder with every beep. As soon as you let go it’ll stop the simulation mode.

Self-testing without the app

You can self-test the device without the app! This can be done by clicking the button on the device for one second, the light will and sound will indicate the status of your smoke detector.

Status Indicator Sound
 Normal  The indicator will go red for a split second and change to yellow.  One beep
 Low battery  The indicator blinks yellow once.  One beep
 Faulty  The indicator blinks yellow three times.  Three beeps
 Fire  The indicator blinks red three times  Three beeps

Device going off without any smoke/fire/condensation

If your device is going off and the indicator light is yellow (not red), it means the battery is empty and it wants you to change it. You can press the button once to disable it for 12 hours, after those 12 hours it will continue to go off until you replace it with a new battery. You can (but not recommend) disable the low battery warning by holding the button for 3 seconds to return it to normal operation mode. It will continue to work as usual but this is not recommended because you might forget to replace it. Because of this it will not be able to warn you anymore (because you returned it to normal mode).


The device is powered by a CR123a battery, which some of you might know from being used in (old-ish) cameras. These might be hard to get from a local shop (at least it was for me) or really pricey (like 10 euro a piece), I was able to pick up some Duracell one’s for 2 euro a piece. But I have ordered some rechargeable ones which I would totally recommend doing, this way you don’t have to buy new ones every couple of years (and way, way better for the environment!). If you replace an old battery make sure to self-check the device after you have replaced the old battery, you want to be sure the battery is working properly.

It actually has a mechanism that blocks you from mounting it on the mounting plate without a battery! 🙂
Be smarter than I am and get some rechargeable ones
Don’t forget to check if it works after you’ve mounted it

HomeAssistant and other third party intergration

The main idea for me was that I can add them to my HomeAssistant. After some struggles of identifying the devices, they worked perfectly. They also work for Domoticz but I do not use it myself.

I have setup 3 around my house, already gave them a quick test with holding 4 burning matches close to the detector.
It will show the smoke density and the battery level.

Just like all the other products that are documented in the xiaomi_aqara component, you just have to setup your gateway via HomeAssistant and everything will show up! Beware it won’t have the same names as the Mi Home app but they will have name likes sensor.smoke.xxxxx. If you want to identify which smoke detector is where, I recommend adding them one by one while rebooting HA after adding one and giving it a friendly_name. You can also use 4 matches to trigger the alarm if you don’t mind it 😉


In conclusion, the device actually quite surprised me. I did not expect for it to have this many features, like the self testing via the app or buttons or setting the sensitivity with the installation site. The device even has tons of features without pairing it with the gateway, like certain beeping and light combinations for device status or battery warnings that you can disable for a certain time period. Being able to choose if you want to mount it with screws or adhesive was also a, not expected, but certainly welcome surprise, mounting the device itself was also super easy and can be done in a minute. The design itself it one of the best things though. They are so small that you barely notice them on your ceiling. And even if you did notice them, you would not mind it because they look so premium and well rounded. I think Mijia and Honeywell did a great collaboration on this one and I would love to see more products from them (please make a smart thermostat). At first I expected a smoke detector with an IoT sticker on it, but was definitely surprised with how feature packed it was. For the price tag of 20,61 euro I can’t even find a comparable product. So if you are obsessed with IoT and needed a good excuse to replace your old smoke detectors, don’t look any further.

Click here to buy the device

7 thoughts to “Review: Xiaomi Mijia Honeywell Smart Fire Detector”

  1. I wish I can turn off the alarm using the mihome app. Can that be done? I am afraid of false alarms in the middle of the night, can there is no way to turn it off unless I press the little button on the device.

    1. If you completely disable it at night, what will you do when there is a real fire at night? Seems pretty counter effective to me

  2. How far are your smoke detectors from the gateway? My gateway is in 3rd floor and smoke detectors are just about 8meters away, and another in the 4th floor about 8m also horizontal distance. Botj can jot be detected by the gateway already

    1. Hey Ben,

      If you go to the Zigbee wiki, you can see the range for Zigbee is anywhere between 10-70m (70m is a perfect situation without walls or anything). You will probably need another gateway if you want to use them that far away.

      Zigbee (what the gateway uses) is the same as Wi-Fi, walls and distance will make it harder to reach the target.

Leave a Reply to peter Cancel reply

Your email address will not be published. Required fields are marked *