Accurate detection,Accurate and error free,More accurate and effective data,Harmful gases have nowhere to hide Air Convection Design,More sensitive and accurate Instrument three-dimensional air duct design,lmproving the airflow penetration rate and accurately,calculating the content of small organic matter Carbon Dioxide: 400-5000 ppm±5%±50ppm CO2 Sound Alarm Range: (default) 1500 ppm Temperature: 0℃ - 50℃(± 1.5℃) / 32°F - 122°F(±2.7°F) Humidity: 20%-80% RH(±5%) Battery: Built-in lithium ion polymer battery (3.7V, 1000mAh) Input: Type-C, DC 5V Storage Temperature: -10°C-55°C / 14°F-131°F Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Colour:A: Green Material:plastic Package Contents: 1 x CO2 Air Quality Monitor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.