Features Multifunctional: This air quality detector combines real time monitoring of carbon dioxide (CO2), temperature and humidity by sensors and displays them on the display. 3000mAh High Capacity Lithium Battery: This CO2 monitor is powered by a built in 3000mAh high capacity lithium battery, 5V micro USB charging, and supports low battery warning. Accurate Monitoring: This carbon dioxide detector has a sampling time of 1.5 seconds, which can be changed in real time for accurate detection. Alarm Function: This CO2 meter has an alarm function for carbon dioxide exceeding the standard, and the alarm can be turned on or off. Wide Application: This humidity temperature air tester has a wide range of applications and can be used at home, office, supermarket and tents, etc. Specification: Item Type: Air Quality Monitor Material: ABS Display: 4.3 Inch LCD Screen Display, 320 x 240 Pixels Atmospheric Pressure: 86Kpa-106Kpa Carbon Dioxide Detection Method: Infrared (NDIR) Sampling Time: 1.5 Seconds Detection Temperature: -10°C-50°C Relative Humidity: 20% -85% Storage Temperature: -10°C-60°C Carbon Dioxide Concentration Unit: PPM Battery: Rechargeable Lithium 3000 mAh x 1 ( Shipped With Built In Battery ) Power Supply: 5V DC Charging Via Micro USB Port Package List:1 x Air Quality Monitor1 x USB Cable1 x Manual Package List 1 x Air Quality Monitor 1 x USB Cable 1 x Manual