This 15-in-1 air quality tester integrates multiple test functions for measuring , CO, CO2, PM0.3, PM1.0, PM2.5, PM10, formaldehyde, TVOC, temperature, humidity, as well as time display, alarm, and countdown functions, 2.8-inch TFT color screen, you can see the clearly at a glance. With the Tuya APP, enjoy real-time testing and remote management of your home's air quality from anywhere you are. Supporting customizes alarm limits, sets sleep modes, and effortlessly explores detailed historical data on air parameters by day, month, or year. After connecting to WiFi, users can set the alarm value according to their needs. Once the measured data exceeds the standard, the device immediately sends out three emergency beeping alarms, and the interface color changes with the air quality (green-nice, orange-warning, red-bad), intuitive warnings to immediate response. Name: Air Quality Tester Detection method: diffusion type Display mode: TFT color screen digital display Working voltage: 5V Temperature measurement range: -10~50 (error 2inch) Humidity measurement range: 0%~99%RH (error 5%RH) Charging method: USB 500mA Type-C interface Charging time: about 4h Standby time: 5h on screen, 7h off screen Battery capacity: 2000mA Note: Due to different production batches, there may be slight differences in products. Colour:White Material:plastic Package Contents: 1 x Air Quality Tester 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.