Description 5-in-1 multifunction air quality monitor can detect CO2, HCHO (formaldehyde), TVOC, temperature and humidity in your living environment. Adopting sensitive sensor, it provides quick and accurate data in the LCD digital color screen. Built in with 1200mAh rechargeable battery, it can be widely in home, office, classroom, hotel, gym, greenhouse, warehouse and more! Features: 1. 5 in 1 Function: Multifunction air quality monitor cares for your health and can be widely used in home, office, classroom, hotel, gym, greenhouse, warehouse, etc. 2. LCD Color Screen: Displays CO2, CO2 index, HCHO (formaldehyde), TVOC, temperature, humidity and battery level. LCD digital color screen for easy and clear reading even in dark environments. 3. Carbon Dioxide Tester: Adopts semiconductor sensor, air convection detection, quickly and accurately detects CO2 concentration in the living environment. 4. 4-color Indicator & Alarm Buzzer: 0-799PPM (Green), 800-1199PPM (Yellow), 1200-1599PPM (Orange), 1600PPM and above (Red). The buzzer alarms when the CO2 concentration is above 1500PPM. 5. Rechargeable Design: Built-in 1200mAh rechargeable lithium battery for strong endurance. With type-C USB interface for quick charging via power adapter, power bank, laptop, etc. 6. Concise Appearance: Simple but stylish appearance, desktop or wall mounted installation, fits in well with different styles of houses. Compact and lightweight, easy to carry. Note: 1. Please read the user manual carefully before use. 2. Size and color may be slightly different due to manual measurement and different light conditions. Thanks for understanding. Specifications: Color: Black/ White (Optional) Material: ABS + Electronic Components 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: Lithium Battery