Feature:    1. [Quick Response] High accuracy carbon dioxide sensing elements, large measurement range and short response time, which is simple to use. 2. [Simple To Use] The perfect choice for monitoring indoor ar quality (IAQ) and HVAC system performance, so you can use it with confidence. 3. [Multipurpose] With large LCD screen, which can display carbon dioxide, temperature, humidity, time and date, to meet your various need. 4. [Alarm Display] The air quality monitor has alarm sound and alarm display, and the carbon dioxide alarm value can be set by yourself. 5. [Widely Application] Carbon dioxide detector is widely used in a variety of situations, such as offices, bedrooms, living rooms, gymnasiums, etc. Specification: Item Type: Carbon Dioxide Detector Model: ST8310 Battery: 750mAh 3.7V lithium battery 14500 (Battery Not Included) Material: ABS Application: Indoor environment detection LCD: LCD segment codes screen Operating Environment: -10& 8451;~50& 8451; Storage Environment: -20& 8451;~70& 8451; Humidity Data Display: 1~99 (resolution 1%RH), error ±4%RH Temperature Data Display: -10~60& 8451; (resolution 0.1), error ±1.5& 8451; CO2 Range: 400~5000PPM (resolution 1PPM), error ± (50PPM+5% reading) Time: year-month- hour-minute Charging Interface: Micro USB, DC5V USB Communication: Insert the USB cable to connect to the computer, the computer can view the data stored in the machine Package List: 1 x Carbon Dioxide Detector (Battery Not Included) 1 x USB Data Cable 1 x Manual