Description Precaution: Due to the environmental impact, please leave it for half an hour after receiving the product and then measure the data, 2-3 is normal. Thanks for your understanding Description: *1. CO2 Detection Range: 400-5000PPM *2. CO2 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. Charging Mode: DC5V 500mA micro USB interface *9. Battery: built-in lithium battery 1500mAh *10. Size: 9*7*3cm/3.54*2.75*1.18inch *11. Screen: about 2.75inch *12. Net weight: about 150g Features: *1. 3-in-1: can use as a carbon dioxide concentration detection, thermometer and hygrometer at the same time. *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 1x USB Charging Cable 1x Manual