As we all know, the air quality of the living environment is very important to human health. And living in an environment with lower air quality will cause certain harm to you and your family. Our indoor air quality monitor can accurately detect whether the air quality in your home contains CO2, temperature and humidity and you take action in time when the air quality is dangerous. Description: 1. CO2 detection range: 400-6000 ppm. 2. CO2 detection sensitivity: 1 PPM. 3. TVOC detection range: 0-2PPM. 4. Temperature measuring range: 0 ~ 60C. 5. Temperature measurement accuracy: 1C. 6. Humidity range: 0% ~ 99% RH. 7. Humidity measurement accuracy: 2% RH. 8. Charging mode: DC 5V 500mA micro USB interface. 9. Battery: Built-in 1200 mAh lithium battery. Features: 1. 5 in 1 can be used as carbon dioxide concentration meter, thermometer and hygrometer simultaneously. 2. Battery Power: Built-in 1200mAh lithium battery, use USB charging cable to charge. 3. Color display: displays current CO2 data, temperature and humidity. The color ring changes depending on the CO2 content. 4. Easy to use: Press and hold the "ON-OFF" button for 3 seconds to turn it on and off. It automatically detects CO2. Contents: 1 CO2 meter. 1 USB charging cable. 1 manual 'use (English language not guaranteed). The built-in 1200 mAh lithium battery, can last about 6-8 hours when fully charged. The product has two colors to choose from: black and white. Configured with 2.8" TFT screen. Product dimensions: 90 x 70 x 40 mm. The color box contains: 1 machine, 1 manual, 1 USB cable.