Description:  *1. CO2 Detection Range: 400-5000PPM  *2. CO2 Detection Sensitivity: 1PPM  *3. TVOC Detection Range: 0-2PPM  *4. Temp Measurement Range: 0~50°C  *5. Temp Measurement Accuracy: ±1°C  *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 press 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