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 Screen brightness can be adjusted by hand<br><br>Mini size very smart Please note: the physical slightly color or difference, does not affect the use, please do not mind, thank you! 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<br><br>Package Contents: 1 x carbon dioxide detector<br><br>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.