Please note that there is a slight color difference or discrepancy in kind, it does not affect the use, please do not mind, thank you! The carbon monoxide detector adopts advanced electrochemical sensor, which can accurately detect the carbon monoxide level and respond quickly, saving your life at the first time when an emergency occurs. To full protection, make sure you have one on every floor and every bedroom of your home. The MIni CO detector is also portable, making it suitable for travel. It can be taken on trips abroad, to hotels, boats, airbnbs, , RVs, and cruises, providing peace of mind wherever you go. Simple to use with just a test/reset button, when dangerous levels of carbon monoxide are detected, the red LED light will flash and 2* batteries (not included),easy to install, Mini size making it portable,It is not affected by power failures and can be installed most place of home,Office. Colour:White Material:plastic Package Contents: 1 x Carbon Monoxide 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.