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: 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: 250g/m; 1, Power on/off: Short to turn on the device. The device start to monitor PM2.5 after 10s. Long to turn off the device. 2, Alarm When the detected result over the setting value, the result blink in red to alarm. Short to set the alarm. Short or to adjust the value when the value is twinkling. Long or to adjust more quickly Short to save the setting. Or short 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, 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.