9 in 1 Air Quality Tester PM2.5 PM10 HCHO TVOC Temperature Humidity Multifunctional CO2 Detector 5V Item Type: CO2 Detector Material: ABS Detection Technology: semiconductor/infrared/electrochemical detection technology Applicable Temperature: 0 to 70 ℃ Display Mode: LCD screen, backlight Charging Voltage: 5V Power Supply Method: 1 18650 lithium ion battery 1200mAh (built in) Charging Port: Type C Sensor: PM2.5 sensor, semiconductor Sensors, electrochemical sensors Examination Scope: PM2.5: 0 to 999 micrograms/m³ PM10: 0 to 999 micrograms/m³ Formaldehyde: 0 to 9.999 mg/m³ Total Volatile Organic Compounds: 0 to 9.9999 mg/m³ Carbon Monoxide: 0 to 5000 PPM Carbon Dioxide: 400 to 5000 PPM Temperature: 0 to 70 ℃ Humidity: 0 to 99% RH AQI: 0 to 999