Features 9 in 1 Tester This detector can detect temperature, humidity, PM2.5, PM10, HCHO, TVOC, CO, CO2, AQI for you at once, and you can check the data you are interested in at any time. FINE WORKMANSHIP: HCHO and CO use electrochemical detection technology, TVOC and CO2 use semiconductor detection technology, and PM2.5 and PM10 use infrared sensors. BACKLIGHT LCD SCREEN: The color screen allows you to see different values at a glance, and the backlit display screen allows you to easily view data even at night. PORTABLE SIZE: This air quality detector can be easily carried or used on your desk. Easy to carry for home and other places to use. LARGE CAPACITY BATTERY: This air quality tester is powered by a built-in lithium battery, which can provide a long service life and be recharged quickly when the battery runs out. Specification: Item type: CO2 detector Material: ABS Detection technology: semiconductor/infrared/electrochemical detection technology Applicable temperature: 0 to 70°C Display mode: LCD display, backlight Charging voltage: 5 V. Power Method: 1 x 18650 1200mAh Lithium-Ion Battery (Built-in) Charging Port: Type C Sensor: PM2.5 sensor, semiconductor Sensors, electrochemical sensors Scope of the examination: 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 5000ppm Carbon dioxide:400 to 5000ppm Temperature: 0 to 70°C Humidity: 0 to 99% RH AQI: 0 to 999 Package list: 1 x Tester. 1 x Charging Cable (Random Color) 1 x Manual Package List 1 x Tester 1 x Charging Cable (Color Random) 1 x Manual