It is a 9-in-1 multifunctional air quality detector that not only monitors various air quality indicators in real time, but also has data storage, export, and download functions, allowing you to gain a understanding of the air around you. Accurately detect key indicators such as CO/CO2, PM2.5, formaldehyde TVOC, Temperature, humidity , Presenting you with a comprehensive and authentic picture of air quality. It has built-in storage space and can continuously record air quality data, effectively preserving historical information on air quality for long-term reliable data reference. Through simple operations, stored data can be quickly exported. To provide you with real-time and reliable data, through analysis, to clearly understand the changing of air quality and improve the environment. When the air quality exceeds the healthy range, you can quickly take corresponding measures. Model: DM509-CO&CO2&PM2.5 Product size: 164x74x26 millimeters (6.4x2.9x1 inches) Power Supply: Rechargeable Lithium Battery 1500mAh Carbon monoxide technology: electrochemistry Carbon dioxide CO2 technology: Infrared (NDIR) PM2.5 sensor technology: laser scattering Formaldehyde HCHO Technology: Electrochemical TVOC Technology: Semiconductor Sensors Carbon monoxide (0-500ppm) Carbon dioxide (400-5000ppm) PM2.5 (0-999 micrograms/cubic meter) Formaldehyde HCHO (0.001-1.999 milligrams per cubic meter) TVOC (0.001-9.999 milligrams per cubic meter) Display parameters including carbon monoxide (CO), carbon dioxide (CO2), PM2.5, HCHO (formaldehyde), TVOC, , temperature, humidity, and time Up to 4000 datasets can be stored Storage format * CSV Preventive measures: When the data reaches 4000 entries, the previous data be automatically overwritten and continue to be stored Color:Black & Orange Material:plastic Package Contents: 1 * 9-in-1 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.