Feature:1. Air Quality Monitor: Carbon dioxide tester can detect carbon dioxide concentration in the air, it can be widely used in home, classroom, hotel room, apartment, office, gym, etc.2. 3 Types Optional: Type 1 features time display and 3-color screen display (Green, 400-1000PPM; Yellow, 1000-3000PPM; Red, 3000-5000PPM); type 3 has more accurate readings. Type 2 has mirror surface and more accurate readings.3. Accurate Sensor: Adopts semiconductor sensor (type 1) or NDIR (type 2/ type 3) detection principle, air convection detection, quickly and accurately detects CO2 in the living environment.4. Alarm Buzzer: When the CO2 concentration is above 1000PPM, the buzzer will beep to remind of you, long press the power button to stop it.5. LCD Screen: Displays carbon dioxide, battery level, temperature and humidity. With large LCD screen, clear to read even in dark environment. With stable base, easy to be placed on the desktop.6. Rechargeable Design: Built-in 1000mAh rechargeable lithium battery for long using time, comes with USB cable, quick to charge it via power adapter, power bank, laptop, etc.Specification:Carbon dioxide detector effectively detects CO2 concentration in the environment you are living. With LCD screen, it displays carbon dioxide, battery level, temperature and humidity. With accurate sensor and alarm function, it can be widely in home, classroom, hotel room, apartment, office, gym and more!Features:Air Quality Monitor: Carbon dioxide tester can detect carbon dioxide concentration in the air, it can be widely used in home, classroom, hotel room, apartment, office, gym, etc.3 Types Optional: Type 1 features time display and 3-color screen display (Green, 400-1000PPM; Yellow, 1000-3000PPM; Red, 3000-5000PPM); type 3 has more accurate readings. Type 2 has mirror surface and more accurate readings.Accurate Sensor: Adopts semiconductor sensor (type 1) or NDIR (type 2/ type 3) detection principle, air convection detection, quickly and accurately detects CO2 in the living environment.Alarm Buzzer: When the CO2 concentration is above 1000PPM, the buzzer will beep to remind of you, long press the power button to stop it.LCD Screen: Displays carbon dioxide, battery level, temperature and humidity. With large LCD screen, clear to read even in dark environment. With stable base, easy to be placed on the desktop.Rechargeable Design: Built-in 1000mAh rechargeable lithium battery for long using time, comes with USB cable, quick to charge it via power adapter, power bank, laptop, etc.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:Type: Type 1/ Type 2/ Type 3 (Optional)Detection Principle: Semiconductor Sensor (Type 1), NDIR (Type 2, Type 3)Color: WhiteMaterial: PlasticScreen: LCD DisplayInput: 5V 1ATemperature Measurement: Range 0~60℃, Resolution 1℃Humidity Measurement: Range 10%~99%, Resolution 1%Carbon Dioxide Testing: Range 400-5000PPM, Resolution 3PPMAlarm Buzzer: SupportScreen Display of Type 1: Green (400-1000PPM), Yellow (1000-3000PPM), Red (3000-5000PPM)Working Environment: Temperature 0℃~60℃, Humidity ＜98%Built-in Battery: 1000mAh Lithium BatteryItem Size: 82 * 82 * 52mm / 3.23 * 3.23 * 2.05inItem Weight: 104g / 3.66oz (Type 1, Type 3); 107g / 3.78oz (Type 2)Package Size: 11 * 11 * 6cm / 4.33 * 4.33 * 2.36inPackage Weight: 148g / 5.21oz (Type 1, Type 3); 161g / 5.68oz (Type 2)Package List:1 * Carbon Dioxide Tester1 * USB Cable1 * User Manual (English)Package List:1 * Carbon Dioxide Tester1 * USB Cable1 * User Manual (English)