20 in 1: Multifunctional air quality detector real-time monitors the CO2 concentration, CO concentration, TVOC value, HCHO value, PM2.5/PM1.0/PM10 value, 5 groups of temperature and humidity parameters in the air, with time and date display, and can also be used as an alarm clock. APP Control: Support connecting Tuya APP to monitor data in real time, so you can easily view it no matter where you are, and also view historical data. Every time you connect APP, the time and date will be automatically updated with your phone, no need to set, more convenient and smarter. Clear Display with Alarm Function: 2.8inch color digital display, clear and easy to read, Celsius/Fahrenheit can be switched, with multiple display modes, you can set it according to your needs. Support alarm function, parameter abnormal will sound an alarm to remind you to make adjustments in time Wide Applications: High-quality plastic material, sturdy and with nice durability, fall . Compact size and , easy to carry, perfect for home, office, school, warehouse, agricultural planting, etc. Display: 2.8 Inch TFT Screen CO2 Detection Ranges: 400-6000PPM, 5015%PPM CO2 Detection Accuracy: 1PPM CO Detection Ranges: 0-500PPM CO Detection Accuracy: 1PPM TVOC Detection Ranges: 0-2.0mg/m3 HCHO Detection Ranges: 0-0.6mg/m3 PM2.5 Detection Ranges: 0-1000ug/m3 PM2.5 Detection Accuracy: 1ug/m3 PM1.0 Detection Ranges: 0-1000ug/m3 PM10 Detection Ranges: 0-1000ug/m3 Temperature Detection Ranges: -20-55, 1 Humidity Detection Ranges: 0-99%RH, 3%RH Subunit Voltage: 3.0V Main Unit Battery: Built-in 3.7V, 2000mAh Lithium Battery Subunit Battery: 2 * AAA Battery(Not Included) Working Current: 280mA Note: Due to different production batches, there may be slight differences in products. Colour:Photo Color Material:plastic Package Contents: 1 x Air Quality Monitor (main unit) 5 x Slave units 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.