Welcome to the store! [5 in 1 Function]: The multi-functional air quality meter takes care of your health and can be widely used in homes, offices, classrooms, hotels, gyms, greenhouses, warehouses, etc. [LCD color screen]: Displays CO2, CO2 index, HCHO (formaldehyde), TVOC, temperature, humidity and battery level. LCD color digital display for easy and clear reading even in dark environments. [Carbon dioxide tester]: Uses semiconductor sensor, air convection detection, quickly and accurately detects the CO2 concentration in the living environment. [4-color indicator and alarm]: 0-799PPM (Green), 800-1199PPM (Yellow), 1200-1599PPM (Orange), 1600PPM and more (Red). The buzzer will alarm when the CO2 concentration is higher than 1500PPM. [Rechargeable Design]: Built-in 1200mAh rechargeable lithium battery for strong endurance. With USB Type-C interface for fast charging via power adapter, power bank, laptop, etc. Screen: LCD Digital Color Screen Voltage: 5V DC Detection Principle: Semiconductor Sensor CO2 Detection Range: 400-5000PPM CO2 Detection Sensitivity: 1PPM HCHO Detection Range: 0-0.6mg/m3 TVOC Detection Range: 0-2.0mg/m3 Temperature Measurement Range: 0-50 Temperature Measurement Accuracy: 1 Humidity Measurement Range: 0~99% RH Humidity Measurement Accuracy: 2% RH Charging Port: Type-C, 500mA Built-in Battery: 3.7V 1200mAh Lithium Battery Size:90x70x35mm Material:ABS Color:Black Package Contents: 1 * Air Quality Analyzer 1 * USB Cable 1 * English Manual Only the above package contents, other products are not included. Note: Light and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3 cm. Your satisfaction is our top priority. We will provide you with the best service. If you find any problems after receiving the product, such as damage, incorrect quantity, etc., please contact us immediately and we will give you the best solution!