Specifications

Everything that can be measured and checked. What has not been confirmed by measurement is not written here.

Table

Body	129.5 × 91.2 × 33.4 mm, solid European ash, R2.5 corners
Stand	108 × 63 × 52 mm, cut from one block of ash, 10° tilt
Screen	IPS 800 × 480 touch, active area 97.6 × 55.9 mm (4.3″), dark theme
CO₂	Sensirion SCD40, infrared (NDIR), 400–2000 ppm, ±(50 ppm + 5 %)
Temperature, humidity, pressure	Bosch BME280; humidity ±3 %; ambient temperature corrected for self-heating
Illuminance	BH1750, 1–65,535 lux
Noise	MEMS microphone, estimated dB(A), 1-minute average; audio recording impossible
Weather	Open-Meteo by location: now, feels like, today, tomorrow, wind, UV, air quality, PM2.5, PM10
History	30 days at 5-minute steps; daily min, mean and max for 5 years; hourly weather for a year
Smart home	Matter over Wi-Fi; Apple Home sees CO₂, temperature, humidity and air quality index; no hub
Network	Wi-Fi 2.4 GHz; works without internet, account or vendor cloud
Power	USB-C, 5 V
Updates	Over Wi-Fi, checked by the device itself; current firmware 2.4.2
Languages	Russian, English

What is on the board and what it can do. Ranges and accuracies are from the manufacturers' datasheets.

CO₂: Sensirion SCD40, photoacoustic infrared (NDIR), 400–2000 ppm, ±(50 ppm + 5 %). Automatic baseline calibration; pressure compensation.
Temperature, humidity, pressure: Bosch BME280. Humidity ±3 % RH; pressure ±1 hPa; ambient temperature corrected for self-heating (two-sensor model).
Illuminance: BH1750, 1–65 535 lux. The sensor window faces backwards; the firmware applies a compensation factor.
Noise: MEMS microphone, 48 kHz, A-weighting per IEC 61672, one-minute average. Estimated dB(A); recording impossible.

Everything is stored on the device. Nothing goes to a vendor server.

History: Room every 5 minutes for 30 days; daily min, mean and max for about 5 years; hourly weather for a year.
Access: History page via the QR code on screen, in the phone browser; a local data interface on the home network.
Smart home: Matter over Wi-Fi; Apple Home sees CO₂, temperature, humidity and air quality index; no hub needed, an iPhone is enough.
Updates: Over Wi-Fi, the device checks for new versions once a day. Current firmware 2.4.2. Update manifest.