Please click here to download the product manualSpecifications Model ZN MT22Monitoring Functions Time AQI CO2 CO Formaldehyde TVOC PM2 5 PM10 Temperature Humidity Curve Function Formaldehyde ComparisonSensors Semiconductor Sensor Infrared Dust SensorDisplay TFT Screen Support Animated Logo Customization Battery Built in Lithium Battery 1200mAh 3 7VCharging Time 2 3 hoursUsage Time 240 360 minutesAdditional Features Curve Display of 24 hour historical dataTemperature Setting Single click to switch temperature double click to mute unmute triple click for calibration 5 click to enter curve formaldehyde settingsOptional Color White Black Features Comprehensive Air Quality Monitoring 12 in 1 Monitoring including AQI CO2 CO formaldehyde TVOC PM2 5 PM10 temperature and humidity High Precision Sensors Equipped with semiconductor and infrared dust sensors for accurate monitoring and measurement of air quality indicators Intuitive TFT Screen Supports animated logo customization and displays color coded alerts when values exceed preset warnings Extended Battery Life Built in 1200mAh lithium battery allows for continuous operation of 240 360 minutes after a full charge User Friendly Interface Easy switching between functions with single double triple and multiple clicks for various settings and sensor calibrations Package Included 1 x ZN MT22 Air Quality Monitor Color as your choice 1 x User Manual1 x Charging Cablemso bidi font family T