Integrated detection with CO2/Temperature/HumidityAuto calibrationExceeding Alarming with auto detection and auto measuringAlarm sound can be turned off / on by hand operationLed Screen displayCO2 Technology:infrared (NDIR)Temperature unit:CelciusCO2 Detection range:400-5000 CO2 Alarm value:1000ppmSupport hand Setting CO2 alarm threshold from 800ppm-2000ppm.CO2 Alarm on /off function(if users do not like alarm ,people can turn it off )Power supply:rechargeable -battery 1600mah includding USB Chargeing cableCO2 Alarm function:CO2 alarm value can be set and can turn off the alarm functionColour:As ShownMaterial:ABSSize:95x100x52MMPackage Contents:1 x carbon dioxide meter1 x USB charging cable1 x English manualOnly 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.