Shop name:Chong Qing Shuo Yue Ke Ji You Xian Gong Si This air quality detector with infrared sensor, detection is very accurate, the quality is very good through the Tuya linkage, can bring you a very good experience Led display: Carbon Dioxide Technology: Infrared (NDIR) PM2.5 sensor technology: laser scattering The unit of temperature between the Celcius and the Fahrenheit switch Detection range: Carbon dioxide detection range: 400-5000 PM2.5 detection range: 0-999 micrograms/ meter detection range: 0-500 HCHO detection range: 0.001-1.999Mg/M3 TVOC detection range: 0.001-9.999Mg/M3 Carbon dioxide alarm value: 1000ppm CO2 alarm on/off function (if you 't like the alarm, you can manually turn it off) Power supply: 2000mah rechargeable lithium battery(included), including USB charging cable size: 190 x 52 x 80mm Material: ABS colour: White Package Contents: 1 x Detectors 1 x usb cable 1 x English instructions 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.