Features: 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 Styles Optional: White, CO2 tester/ CO2 and smoke tester; wood color, CO2 tester. The second style features both carbon dioxide and smoke detection, providing better protection. Accurate Sensor: Adopts CO2 sensor and photoelectric smoke sensor, air convection detection, quickly and accurately detects CO2 and smoke in your home. CO2 Alarm Function: When the CO2 concentration is above 1000PPM, the buzzer will beep 2 times; above 1500PPM and 2000PPM, beeping for 15 seconds. Displays carbon dioxide, battery level, temperature and humidity. Large LCD screen, clear to read even in dark environment. Desktop or wall mounted installation method. 4-Color Indicator Bar: Green (0-499PPM), Yellow (500-999PPM), Orange (1000-1499PPM), Red (1500PPM and above). Built-in 1400mAh rechargeable battery for long using time, quick to charge via type-C port through 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 lighting conditions. Thanks for understanding. Specifications: Color & Style: White, CO2 Tester/ White, CO2 & Smoke Tester/ Wood Color, CO2 Tester (Optional) Material: Fireproof ABS Screen: LCD Screen, Color Digital Display Input: DC 5V Temperature Measurement Range: -20℃~60±2℃ Humidity Measurement Range: 5%~95%±5% Carbon Dioxide Test Range: 400-5000PPM; Resolution: 1PPM Indicator Bar: Green (0-499PPM), Yellow (500-999PPM), Orange (1000-1499PPM), Red (1500PPM and above) Carbon Dioxide and Smoke Alarm: 85dB (1-3m) Smoke Sensitivity: 0.1% db/m-0.3% db/m Working Temperature: 0℃~50℃ Storage Temperature: -10℃~60℃ Built-in Battery: 1400mAh Li-ion Polymer Battery Item Size: 140 * 103 * 53mm / 5.51 * 4.06 * 2.09in Item Weight: 210g / 7.38oz Package Size: 17 * 17 * 6.3cm / 6.69 * 6.69 * 2.48in Package Weight: 328g / 11.55oz Package List: 1 * Carbon Dioxide Tester 1 * 2m USB Cable (Type-C) 1 * User Manual (English)