Wifi digital lcd display co2 meters tvoc hcho aqi carbon dioxide detector gas analyzer protable air quality tester The product is based on the color or size of the main image of the product page. This product is a multifunctional air quality monitor that detects Carbon dioxide (CO2),Formaldehyde (HCHO), Total Volatile Organic Compounds (TVOC), Particulate Matter Less than 2.5 Micrometre-sized particles (PM2.5/1.0/10), Temperature, and Humidity with clock and record function. WIFI Multi-function Air quality detector Wifi connect Tuya app PM2.5 Sensor technolology : Scattering HCHO/TVOC :Electrochemistry sensor CO2 Technology : infrared ( NDIR) LCD screen display,24 hours real time monitoring. Detection range: AQI(0-500) PM2.5 (0-999 ug/M³) CO2 ( 0-5000 ppm) HCHO(0.001-1.999Mg/M³) TVOC(0.001-9.999Mg/M³) Power supply:rechargeable Li-battery 3000mah weight: 225g DIY Supplies: Electrical Model Number: DM72B air quality detector colour:Silver & Black material:Metal + ABS size:145*78*97.2 MM Package Contents: 1*Air Quality Tester 1*Charging Cable Only the above package content, other products are not included. Note: Light shooting 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.