Integrated detection with PM2.5/Temperature/Humidity Auto calibration Exceeding Alarming with auto detection and auto measuring PM2.5 Detection range: 400-5000 ppm - PM2.5 Alarm value : 1000ppm Support hand Setting PM2.5 alarm threshold from 800ppm-2000ppm. PM2.5 Alarm on /off function(if users do not like alarm ,people can turn it off ) Please note: the physical slightly color or difference, does not affect the use, please do not mind, thank you! Indoor Professional Gas Analyzer PM2.5 Meter Monitor Detector Carbon Dioxide Air Quality Sensor Tester This product is a MINI carbon dioxide detector, which can detect carbon dioxide Temperature and humidity display and intuitive carbon dioxide alarm function display Temperature:Celcius Different colors represent different concentrations of carbon dioxide It can be monitored 24 hours a day It has a lithium-ion battery and can be recharged from USB Colour:White Material:plastic Package Contents: 1 x Air Quality Detector 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.