Features:  3 in 1 Function: Multifunction carbon dioxide monitor cares for your health and can be widely used in home, office, classroom, hotel, car, cellar, greenhouse, warehouse, etc.  LCD Color Screen: Displays CO2, CO2 index, temperature, humidity, date, time and battery level. LCD digital color screen for easy and clear reading even in dark environments.  Carbon Dioxide Tester:  Adopts semiconductor sensor, air convection detection, quickly and accurately detects CO2 concentration in the living environment.  4-color Indicator & Alarm Buzzer: 0-999PPM (Green), 1000-1999PPM (Yellow), 2000-2999PPM (Orange), 3000PPM and above (Red). The buzzer alarms when the CO2 concentration is too high.  Dual Power Supply: Powered by 3 AA batteries (not included) or external Type-C USB cable. Simple but stylish appearance, just place it on the desktop, fits in well with different house styles.    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  Detection Principle: Semiconductor Sensor  CO2 Detection Range: 400-5000PPM  CO2 Detection Sensitivity: 1PPM  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  Power Supply: 3 * AA Battery (Not included) or External USB Cable  Item Size: 143 * 90 * 68mm / 5.31 * 3.54 * 2.68in  Item Weight: 158g / 9.58oz  Package Size: 15.3 * 10 * 7.8cm / 6.02 * 3.94 * 3.07in  Package Weight: 251g / 8.85oz    Package List:  1 * CO2 Tester  1 * USB Cable (Type-C)  1 * User Manual (English, Japanese, Italian, German, Spanish, French)      By the way,if you like our store,please add our store to your Favorite Stores.You can get our New arrival and Discount   information in time.