Integrated detection with CO2/Temperature/Humidity Auto calibration Exceeding Alarming with auto detection and auto measuring Alarm sound can be turned off / on by hand operation Led Screen display CO2 Technology:infrared (NDIR) Temperature unit:Celcius CO2 Detection range:400-5000 ppm CO2 Alarm value:1000ppm Support 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 Li-battery 1600mah includding USB Chargeing cable CO2 Alarm function:CO2 alarm value can be set and can turn off the alarm function Colour:As Shown Material:ABS Size:95x100x52MM Package Contents: 1 x carbon dioxide meter 1 x USB charging cable 1 x English manual 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.