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[5 in 1 Function]: The multi-function air positive display screen takes care of and may be broadly used , office, classroom, hotel, gym, greenhouse, warehouse, etc. [LCD Color Screen]: Displays CO2, CO2 index, HCHO (formaldehyde), TVOC, temperature, humidity and battery level. LCD color electronic show for straightforward and clean learning even in dark environment. [Carbon Dioxide Tester]: Adopt semiconductor sensor, air convection detection, quickly and precisely stumble on CO2 concentration in living environment. [4-color indicator and alarm buzzer]: 0-799PPM (Green), 800-1199PPM (Yellow), 1200-1599PPM (Orange), 1600PPM and extra (Red). The buzzer will alarm when the CO2 focus is greater than 1500PPM. [Rechargeable Design]: Built-in 1200mAh rechargeable lithium battery for stable endurance. With USB Type-C interface for instant charging by way of way of energy adapter, calories 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/m3 TVOC Detection Range: 0-2/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: three 1200mAh Lithium Battery size:90x70x35mm Material:ABS colour:Black Package Contents: 1 * Air Quality Analyzer 1 * USB Cable 1 * English guide Only the above kit content, assorted merchandise are not included. Note: Light and assorted reveals may cause the colour of the article in the photo a bit of different from the genuine thing. The size allowed error is +/- 1-3cm.