TVOC1 Portable CO2 Air Quality Formaldehyde Carbon Dioxide Detector Indoor Temperature Hygrometer with LED Digital Display(Black) 1. CO2 detection range: 400-6000PPM 2. CO2 detection sensitivity: 1PPM 3. Detection range: 0-2PPM 4. Temperature measurement range: 0~60 degrees Celsius 5. Temperature measurement accuracy: +-1 degrees Celsius 6. Humidity measurement range: 0%~99%RH 7. Humidity measurement accuracy: +-2%RH 8. Charging method: DC5V 500mA micro USB interface 9. Battery: Built-in lithium battery 1200mAh 10. Size: 9 x 7 x 4cm3.54 x 2.75 x 1.18inch 11. Screen: about 2.75 inches 12. Net weight: about 175g feature: 1. Five in one: It can be used as carbon dioxide concentration detection, thermometer and hygrometer at the same time. 2. Built-in 1200mha lithium battery, fully charged can stand by for about 6-8 hours 3. Color screen: display current CO2 data, temperature and humidity data. The color ring changes according to the CO2 content. 4. Simple operation: long press the "on-off" button for 3 seconds to turn on and off. It will automatically detect CO2. 5. Small and portable: it can be placed in the kitchen, living room, bedroom, or taken out. The package includes: 1 x Carbon dioxide meter 1 x USB charging cable 1 x Manual