Features: The CO2 detector use the most advanced NDIR sensor, accurately and quickly detect the CO2 concentration. 2.8-inch TFT color screen, resolution :240RGBx320, clearly display CO2 level in the surrounding air. Accurate to 0.3 μm (μm), single response time: < 1 second (s), comprehensive response time: ≤10 seconds (s), PM2.5 range: 0~2500ug/m³ (standard value), measured above 1000ug/m³ shall prevail. Carbon dioxide sensor, accuracy: ±50ppm /±5%, range: 400-9999ppm, single response time: 2 seconds (s), power-on response after starting, you can switch different display interface through the top button of the product. Suitable for environment where good air quality is needed, such as: house/apartment, car, office/meeting room, school, hospital, vegetable shed, warehouse etc. Specifications: Material: ABS+Metal Screen Size: 2.8-inch Resolution: 40RGBx320 Built-in battery: 2600MA, rechargable Measuirng range: 400-9999 PPM Package Includes: 1X CO2 Monitor note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.