Description Description: *1. CO2 Detection Range: 400-6000PPM *2. CO2H Detection Sensitivity: 1PPM *3. TVOC Detection Range: 0-2PPM *4. Temp Measurement Range: 0~50C *5. Temp Measurement Accuracy: 1C *6. Humidity Measurement Range: 0%~99%RH *7. Humidity measurement Accuracy: 2%RH *8. With buzzer (value greater than 1000) *9. Support Bluetooth compatible APP, read up to 1440 sets of data for 60 days *10. Size: 9*7*3cm/3.54*2.75*1.18inch *11. Screen: about 2.75inch *13. Net weight: about 320g Features: *1. 6 in 1: can use as a carbon dioxide concentration detection, thermometer and hygrometer at the same time. TVOC/HCHO/Bluetooth compatible *2. Battery supply: built-in 1500mAh lithium battery, use USB charging cable to charge it. *3. Color screen: display the current CO2 data, temperature and humidity data. The colored ring will change according to the CO2 content. *4. Easy to operate: long pre the on-off key for 3 seconds to turn on and off. It will detect the CO2 automatically. *5. Compact and portable: can be placed in the kitchen, living room, bedroom, or take it when going out. Package Includes: 1x CO2 Meter 1x18650 battery 1x Manual Note: The product is sealed and shipped for 7 to 15 days, because there are perfume and other gases in the box. After receiving the product, you need to stand for 1 hour, wait for the abnormal gas to volatilize, and start normal measurement; In addition, if the sensor is heated for more than 2 hours, the temperature measurement will be 2 to 3 degrees Celsius higher than the normal temperature. This is a normal error. If it is unacceptable, please do not buy it, thank you