Feature: 1. Lightweight And Portable: The detector is small in size and light in weight, making it easy to carry around for measurement and use. 2. Easy To Install: The carbon dioxide detector does not take up too much space and can be installed at home. 3. Intelligent Color Screen Display: Clear numbers, easy to identify and read, very convenient for you to observe the testing data. 4. Easy To Use: Real time monitoring and real time display of carbon dioxide concentration per cubic meter, very easy. 5. Multifunctional Detector: It can detect dioxide, air quality, formaldehyde concentration, temperature and humidity. Specification: Item Type: Carbon Dioxide Detector Material: ABS Model: ZN-AZ-2CO3 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/m³ HCHO Measuring Range: 0-0.6mg/m³ Temperature Measurement Range: -10~50℃ Temperature Measurement Accuracy: ±2℃ Humidity Measurement Range: 0%~99%RH Humidity Measurement Accuracy: ±3%RH. Package List: 1 x Carbon Dioxide Detector 1 x USB Data Cable1 x Manual Note: 1. This product has a built in lithium battery. When operating with a standard DC‑5V charger, do not block the air inlet and outlet to avoid value deviation.2. Do not use it frequently in a dusty environment with poor air quality to extend its service life.3. 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.4. Please avoid exposure, rain or moisture of the equipment and accessories, otherwise it may cause failure or dangerous of the display, battery, casing and circuit.5. Do not insert incisive objects such as pins into the air inlet, outlet or charging space to avoid damage to the device.