Feature: 1. 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 care about at any time. 2. BACKLIT 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. 3. 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. 4. LARGE CAPACITY BATTERY: This air quality tester is powered by a built in lithium battery, which can provide a long service life and be charged promptly when the battery runs out. 5. FINE WORKMANSHIP: HCHO and CO use electrochemical detection technology, TVOC and CO2 use semiconductor detection technology, and PM2.5 and PM10 use infrared sensors. Specification: 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 . Package List: 1 x Tester 1 x Charging Cable (Color Random)1 x Manual