Air Quality Monitor WiFi 9 in 1 Multifunctional Portable CO2 Monitor for Wine Cellars Homes Item Type: Air Quality Monitor Material: ABS Application: Support for Tuya app Connection Method: Wifi Screen Display: HD LCD color screen Carbon Dioxide Technology: NDIR PM2.5 Sensor Technology: Light scattering Temperature Unit: Celsius and Fahrenheit units switch, 24 hours real time monitoring of temperature Detection Range: PM2.5 (0 to 999ug/M³) CO2(400 to 5000 ppm) CO2 Alarm Value: 1000PPM CO2 Alarm: On or off function Battery: 1 x 18650 2000mah rechargeable lithium battery (shipped with built in battery) Atmospheric Pressure: 86Kpa to 106Kpa Sampling Time: 1.5 seconds Detection Temperature: -10°C to 50°C Detection Humidity: 20% to 85% Storage Temperature: -10°C to 60°C