Feature:1. Multifunctional: This air quality detector combines real time monitoring of carbon dioxide (CO2), temperature and humidity by sensors and displays them on the display.2. 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.3. Accurate Monitoring: This carbon dioxide detector has a sampling time of 1.5 seconds, which can be changed in real time for accurate detection.4. Alarm Function: This CO2 meter has an alarm function for carbon dioxide exceeding the standard, and the alarm can be turned on or off.5. 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 MonitorMaterial: ABSDisplay: 4.3 Inch LCD Screen Display, 320 x 240 Pixels Atmospheric Pressure: 86Kpa-106Kpa Carbon Dioxide Detection Method: Infrared (NDIR) Sampling Time: 1.5 SecondsDetection Temperature: -10C-50C Relative Humidity: 20% -85%Storage Temperature: -10C-60CCarbon Dioxide Concentration Unit: PPMBattery: 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