```html

Technical Features

• Adjustable CO₂ range from 300 to 2000 ppm.
• Built-in CO₂, temperature and humidity sensor.
• Integrated light-dependent resistor (LDR) / light sensor.
• Displays current CO₂, temperature and humidity readings, including minimum and maximum values.
• Screen updates every second.
• Integrated calibration function for calibrating the CO₂ sensor indoors or outdoors.
• Built-in fan for optimal air circulation, ensuring fast and accurate measurements.
• LED indicators for CO₂ dosing and stable climate conditions.
• Setpoint and hysteresis settings are retained in the event of a power failure.
• Automatically switches between day and night modes using the integrated light sensor.
• Automatic screen backlight shut-off after 60 seconds.

Technical Specifications

• Power supply: 100–240 V
• Power consumption: 3 W
• Fuse: 4 A
• CO₂ adjustment range: 300–2000 ppm
• CO₂ hysteresis range: ±20–200 ppm (recommended hysteresis: 50 ppm)
• Measurement interval: 1 measurement per second

```