SwitchBot CO2 detector with Built-in Hygrometer, Temperature Humidity Monitor with carbon dioxide monitor, Bluetooth CO2 Monitor, 2-Year Data Storage, SwitchBot Hub Required for WiFi Function

I bought this as I was concerned about CO2 levels in my home office, particularly in winter when the windows tend to be shut and the door is shut during meetings. I'd been feeling quite drowsy in the afternoons and wondered whether this had something to do with CO2 levels. It sits on my desk and displays temperature, humidity and CO2 levels. I've quickly realised how fast the CO2 levels rise in my small office when I'm in meetings and it's a really good prompt to crack open a window and refresh the air. I'm an avid home assistant user and this integrates well. You need the switchbot app to setup initially but I haven't bothered with a switchbot hub as home assistant picks up it's bluetooth (you need a device to act as a bluetooth proxy e.g. pretty much any ESP32 device, a Shelly relay etc). In Home Assistant it was detected automatically and I get readings for - temperature and humidity (I think these are updated every minute), - CO2 PPM which is updated ~25min, - battery level I've no idea how accurate the CO2 PPM is as I've got nothing to compare it to, but I don't need it to be calibrated, I'm just interested in the trends (normal ventilated room is between 400 and 700, stuffy office with door close is >1200) The size is good and it comes with a kick-stand for sitting on your desk but there's also a slot for mounting on a screw or picture hook if you want it on the wall. The device feels solid - not flimsy at all and the display is crystal clear and a really good size. The device can be powered by USB-C or battery. I've had it running on my desk for about a month and the provided batteries are still showing 100% CO2 monitors aren't cheap, but I was quite happy to pay £55 for this and consider it good value for money

I bought this on the recommendation of a friend who also works from home and told me that I should probably be more concious of the CO2 in my front room where I spend most of my working hours. I set this up and had everything working within minutes, which was really easy. The app was easy to use and get everything set up to UK temperature and date format. First off, the detector unit is weighty but not heavy which is reassuring that it is of a good quality. The actual monitor itself has two primary modes, powered and unpowered, which for most will only effect how often the CO2 reading updates. In the case of powered, as low as every 30 seconds, and in the case of unpowered, every 20-30 minutes. The reading is displayed clearly on the screen so you can see it from across the room, alongside some other data like the time, date, temperature and humidity of the room. The data seems pretty accurate but you'd be surprised quite how much these variables change in a space as small as a room. I have another temperature/ moisture sensor on a shelf on the other side of my office about 1.5m up on the wall and it (as expected) reads slightly colder compared to the Switchbot unit which is next to my PC and workstation which will naturally be much warmer. There's probably something to be said as well about where specifically you put it in the room effecting the reading since CO2 is one of the more dense molecules in air, wet air clings to the ground and hot air rises so all the readings will vary slightly even in the same room - that's all normal and to be expected. I manage battery life by having it powered by my PC computer, so when I'm working the unit is powered and the CO2 readings update every minute, but when I'm not working it only updates twice an hour. No issues on battery life at all so far. Overall I am tremendously happy with this and would definitely recommend especially if you (or multiple people in your household) work from home and want to monitor the CO2 levels.

Great product, operates well and integrates into Home Assistant smoothly. The CO2 readings are fascinating and give a real insight into the ventilation effectiveness in the flat. Only drops a star because the first unit was faulty - the reading after plugging it in jumped up by around 200+ ppm, then back down again on battery power. The support process was slow with inane questions and pointless troubleshooting despite the obvious problem, but after about 3 weeks a replacement did arrive and this works perfectly.

Easy to set up, informative. Let me know time to open the living room door to reduce CO2 level.

Precise and reliable. Tested it with other devices and this item was the only keep. Not only because it provided accurate readings, but the phone connectivity is also excellent for calibration to historical data. Great value for the money.

The SwitchBot Air Quality Monitor has been a fantastic addition to my smart home setup. Its 5-in-1 functionality is incredibly convenient, providing detailed readings for temperature, humidity, CO2 levels, and more—all in one glance. I especially appreciate the multi-point monitoring feature, as it lets me track both indoor and outdoor conditions. The app alerts are very useful, notifying me when levels go out of range even when I'm away. Setup was easy, and the air quality monitor seamlessly integrates with the other Switchbot products like the Smart Humidifier. It can be wired or used wirelessly and charged which is super convenient. Highly recommend!

Works well and I have the data picked up by home assistant, the CO2 is updating very regularly which is essentially why I have this. This allows me to make decisions to open windows as needed for good internal health. I have three types of CO2 sensor in the house. Tado - this only updates every 30 minutes. Switchbot with 1 minute update in comparison easily wins here. ESPHome based self assembled and coded. This is nice, but sourcing components and writing code takes a lot of effort. Switchbot while slightly more expensive also wins here for simple ease of use and getting up and running immediately. Overall the CO2 monitor from Switchbot is my preferred option. Note first unit sent was faulty and would not correctly detect CO2 levels, however was able to easily return and obtain another via Amazon.

I use this in my child's room to monitor temperature and co2 levels. The temperature seems to be very accurate and the co2 sensor is excellent and you can see the difference when you leave the window vented overnight. I have this showing in my home assistant dashboard but you can easily see the readings in the switchbot app too. The display is very clear and battery is lasting well so far.