Feature: 1. [3 IN 1 AIR QUALITY MONITOR] Used for carbon dioxide detection, hazard assessment, temperature and humidity detection, with functions of intelligent alarm system, gas recognition algorithm, multi anti interference, air convection technology and greenhouse compensation calibration. 2. [ACCURATE AND FAST] Use more professional infrared optical principles to accurately and quickly detect carbon dioxide and update data in real time. 3. [LARGE SCREEN AND HIGH PERFORMANCE CHIPS] The large screen design is clear and easy to see. The use of high performance chip makes the measurement more accurate. 4. [HIGH QUALITY MATERIAL] Made of high quality ABS material, sturdy and durable, and long service life. Easy to operate and use. 5. [WIDE RANGE OF APPLICATION] Suitable for carbon dioxide concentration detection in offices, homes, gymnasiums and other usage scenes. Specification: Item Type: Carbon Dioxide Detector Model: ZN-AZ-2CO1 Material: ABS Battery: 18650 1500mAh 3.7V (Battery Included) Charging Power Supply: DC 5V 500mA Micro USB Purpose: Suitable for carbon dioxide concentration detection in offices, homes, gymnasiums and other usage scenes. Basic Parameters: CO₂ Measurement Range: 400-6000 PPM ±50 ±5%PPM CO₂ Measurement Accuracy: 1PPM 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 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.4. 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.5. Please avoid exposing the equipment and accessories to rain or moisture, otherwise it may cause the display screen, battery, casing and circuit to malfunction or danger.6. Do not insert incisive objects such as pins into the air inlet, outlet or charging space to avoid damage to the device.