name: PM2.5 Detector. Material: Plastic. Color: White + black Model Number:SW-825. With LCD Screen Or Not:Yes. Gas Type:PM2.5 PM2.5 Measuring range:0~500ug/m. Resolution ratio:1ug/m. Temperature Measuring Range:-10C ~50C Humidity Measuring Range:0%-99%RH. Battery:Buit-in lithium battery 580mAh With Alarm:yes. Single response time: Less than 1S. Composite response time:10S. Counting Efficiency of Particulate Matter:50%@ 0.3m 98%@ 0.5m Mass Concentration Consistency of Particulate Matte:10% @ 100 ~ 500ug/m; 10ug/m; @ 0 ~ 100g Temperature Accuracy:0.3 Humidity Measuring Range:0%~99%RH Humidity Accuracy:3%RH working time for Once Charging: Greater than 4.5/h Auto Power off:30minutes ( it cannot be power off automatically while charging time.) Grade of Air Quality:Average Value of PM2.5 in 24hours Great:0~35g/m; Good:35~75g/m; Mildly Polluted:75~115g/m; Moderately Polluted:115~150g/m; Seriously Polluted:150~250g/m; Severely Polluted: Greater than 250g/m; 1, Power on/off: Short press to turn on the device. The device start to monitor PM2.5 after 10s. Long press to turn off the device. 2, Alarm When the detected result over the setting value, the result will blink in red to alarm. Short press to set the alarm. Short press or to adjust the value when the value is twinkling. Long press or to adjust more quickly Short press to save the setting. Or short press to cancel the setting and return to the main screen 3, Battery Charging: The device ex-factory with USB connector. A power adapter with DC 5V, Greater than 500mA is suggested for charging. Package Contents: 1 x PM2.5 Detector 1 x USB Connector 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.