[High Sensitivity Sensor Design]:Carbon Monoxide fire alarm is a Catalytic Combustion Sensor and the Electrochemical Carbon Monoxide Sensor; Protect yourself and your family from two deadly threats. When dangerous concentrations of Carbon Monoxide or Explosive gases are detected, you immediately to save your life in the first place.[Easy To Use]:Push/test button - Connect to 90V-240V or 9V rechargeable battery(not included), The detector will display 3 minutes counting.[LCD Digital Display]:This display clearly shows levels of Gas that the unit has detected and stored-- from 0 to 3000 ppm--and it updates every 9 seconds to indicate any sudden changes.[Voice Alarm]:When the concentration of Carbon Monoxide reaches 100PPM or the concentration of Combustible gas reaches 6%, the LCD screen begins to display the concentration value, and the red LED lights flash and emit a loud voice alarm mode -- 110 decibel alarm.[Easy Installation & Quality]:Easy to mount on any wall or ceiling without an electrician;The detector has been rigorously tested and passed UL2034 safety certification, If you have any questions, Please contact by E-mail, We will give you a SATISFACTORY SOLUTION. supply from AC 90V-240V or 9V rechargeable battery (Not included).AV voltage: AV 9V-240V 50-60HzBattery voltage: 9V rechargeable battery(Not included)Working temperature: 0-50degCEnvironment humility: 10%-95%Alarm density: 2500PPM(plusmn1500PPM)Alarm time: keep alarming after over 2500PPMPlug Type :EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on.Voltage: AC90-240VColour:WhiteMaterial: ABSSize: 112 x 73 x 42MMPackage Contents:1 x Gas DetectorOnly 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.