Measurement objects: CO2, temperature, humidity.Sensitive and Accurate: Equipped with an infrared sensor and a built-in fan that inhales the surrounding air for more accurate real-time results.Rechargeable: large lithium battery with a capacity of 2000 mAh. 5V micro USB charging and low battery warning. 4.3 inch color LCD display: 320 x 240 pixels, 24-hour real-time monitoring, real-time display of CO2 (carbon dioxide), temperature and humidity.Auxiliary function: clock and recording function. Set time and date: Press the up / down button to select date or time and press the power button to confirm the date or time. The up / down button and the toggle button are on the back of the product.