CO2 Detector Carbon Dioxide Gas Concentration Meter Temperature Humidity Measuring Machine Item Type: CO2 Detector ℃ Material: ABS Uses: Can be widely used in homes, educational institutions, VIP sports venues, business offices, agricultural planting, greenhouse vegetables, production warehouses, raw material processing, etc. Carbon Dioxide Detection Range: 400~5000PPM Carbon Dioxide Detection Sensitivity: 1PPM TVOC Detection Range: 0-2PPM Temperature Measurement Range: 0~50℃ Temperature Measurement Accuracy: ±1℃ Humidity Measurement Range: 0%~99%RH Humidity Measurement Accuracy: ±2%RH Charging Method: DC 5V 500mA Type-C interface Battery: 1200mAh lithium battery x 1 (built-in) How e: 1. Press and hold the "on-off" button on the right for 3 seconds to turn it on and off, and then the current air quality parameters will be displayed. 2. CO2 Detector: Display the current CO2 data and temperature and humidity data, the colored ring will change according to the change of CO2 3. You can charge the USB by plugging in a 5V power supply. The battery icon flashes in the charging state and stops when it is fully charged. If the display is full but still flashing, it means the charging is not saturated. please wait a moment