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! 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: White Material: Plastic Screen: LCD Display Input: 5V 1A Temperature Measurement: Range 0~60, Resolution 1 Humidity Measurement: Range 10%~99%, Resolution 1% Carbon Dioxide Testing: Range 400-5000PPM, Resolution 3PPM Alarm Buzzer: Support Screen 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 Battery Item Size: 82 * 82 * 52mm / 3.23 * 3.23 * 2.05in Item Weight: 104g / 3.66oz (Type 1, Type 3); 107g / 3.78oz (Type 2) Package Size: 11 * 11 * 6cm / 4.33 * 4.33 * 2.36in Package Weight: 148g / 5.21oz (Type 1, Type 3); 161g / 5.68oz (Type 2) Package List: 1 * Carbon Dioxide Tester 1 * USB Cable 1 * User Manual (English)