Features MULTIFUNCTIONAL - This air quality detector combines real-time monitoring of carbon dioxide (CO2), temperature and humidity by sensors and displays them on the screen. 【3000mAh High Capacity Lithium Battery】This CO2 monitor is powered by 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 that exceeds the standard and the alarm can be activated or disabled. Wide Application This air temperature and humidity tester has a wide range of applications and can be used in home, office, supermarket and tents, etc. 1. MULTIFUNCTIONAL - This air quality detector combines real-time monitoring of carbon dioxide (CO2), temperature and humidity by sensors and displays them on the screen. 2. 【3000mAh High Capacity Lithium Battery】This CO2 monitor is powered by 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 that exceeds the standard and the alarm can be activated or disabled. 5. Wide Application This air temperature and humidity tester has a wide range of applications and can be used in home, office, supermarket and tents, etc. Specification: Item Type: Air Quality Monitor Material: ABS Display: 4.3 inch LCD screen, 320 x 240 pixels Atmospheric pressure: 86Kpa-106Kpa Carbon dioxide detection method: Infrared (NDIR) Sampling Time: 1.5 seconds Detection temperature: -10℃-50℃ Relative humidity: 20%-85% Storage temperature: -10℃-60℃ Carbon dioxide concentration unit: PPM Battery: Rechargeable Lithium 3000mAh x 1 (ships with built-in battery) Power supply: DC 5V Charging via micro USB port How to use : Operate according to the manual. Packing List: 1 x Air Quality Monitor 1 x USB cable. 1 x Manual Package List 1 x Air Quality Monitor 1 x USB Cable 1 x Manual