Description 3-in-1 multi-function air quality monitor can detect CO2, temperature and humidity in your living environment. Adopting sensitive sensor, it provides fast and accurate data in the large digital color screen. Powered by rechargeable lithium battery, it can be widely used in home, office, classroom, hotel, car, basement, greenhouse, warehouse and more Features: 3 in 1 function - CO2 / temperature / humidity tester. The multi-function carbon dioxide monitor takes care of your health and can be widely used at home, office, market, classroom, hotel, car, basement, greenhouse, warehouse, laboratory, etc. 11.2 inch digital LED display - Shows CO2, air quality level (by 4-color expressions), temperature, humidity and battery level. Large digital color screen for easy and clear reading even in dark environments. Carbon Dioxide Tester - Adopts NDIR sensor and air convection detection, quickly and accurately detects the concentration of CO2, ambient temperature and humidity in the living environment. Comfortable level, Alarm buzzer - Normal, 400-1000PPM (green); slightly high, 1001-2000ppm (orange); High, 2001-3000PPM (yellow); Ultra high, 3001-5000PPM (red). Clear at a glance, old people and children can easily recognize too. Adjustable CO2 concentration alarm valve, there will be 5 beeps when reaching the alarm value. Rechargeable Battery - Built-in 1200mAh lithium battery, strong endurance and easy to recharge. Simple but elegant appearance, put it on the desk or wall installation, fits well with different home styles. Mirror surface, adjustable brightness - It can be used as a cosmetic mirror on the desk , very convenient to use. 6 levels of adjustable LED brightness, easy to adjust via up/down buttons. 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. Thank you for your understanding. Package List: 1 * CO2 Tester 1 * USB Cable 1 * Manual the user (English) Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin