Description 1Small And Clear Display: This carbon dioxide detector is small and portable, and can clearly display the temperature and humidity of the environment. 2Multi Function, Multi Application: 5 in 1 multifunction air detector, suitable for offices, homes, gymnasiums and other places. 3Alarm Reminder: In the alarm mode, the user is reminded to pay attention to the environment by changing the color. 4Data Display: It can detect and display the temperature and humidity of the environment to help users understand the environment. 5Real Time Reading: Bluetooth data storage function, real time monitoring of environmental data, improve the quality of life. Item Type: AirQualityDetector Model: ZN-AZ-2CO3TB Material: ABS Battery: 18650 1500mAh 3.7V (Built-In Battery) Charging Power Supply: DC 5V 500mA Micro USB Purpose: Suitable for Carbon Dioxide Concentration Detection In Offices, Homes, Gymnasiums And Other Usage Scenarios CO2 Measurement Range: 400-6000 PPM 50 5%PPM CO2 Measurement Accuracy: 1PPM TVOC Measuring Range: 0-2.0mg/m^3 HCHO Measuring Range: 0-0.6mg/m^3 Temperature Measurement Range: -10~50 Temperature Measurement Accuracy: 2 Humidity Measurement Range: 0%~99%RH Humidity Measurement Accuracy: 3%RH 1 x Carbon Dioxide Detector 1 x USB Data Cable 1 x Manual This product has a builtin lithium battery. When operating with a standard DC5V charger, do not block the air inlet and outlet to avoid value deviation.Do not use it frequently in a dusty environment with poor air quality to prolong its service life.Do not use the device near high temperature, high humidity, dirt, or strong magnetic fields to avoid inaccurate values or internal circuit failure.Store the equipment and accessories in the temperature range of 20~55. When the ambient temperature is too low or too high, it may cause equipment failure.Please avoid exposing the equipment and accessories to rain or moisture, otherwise it may cause failure of the display, battery, casing and circuit.Do not insert sharp objects such as pins into the air inlet, outlet or charging space to avoid damage to the device.