[High Sensitivity Dual Sensor Design]:Carbon Monoxide fire alarm is a Catalytic Combustion Sensor and the Electrochemical Carbon Monoxide Sensor; yourself and your from two deadly threats. When dangerous concentrations of Carbon Monoxide or gases are detected, you immediately to save your life in the first place. [Easy To Use]:/test button - Connect to power 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 the unit has detected and stored-- from 0 to 3000 ppm--and it updates 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 alarm. [Easy Installation & ]: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 us by E-mail, We will give you a SATISFACTORY SOLUTION. Power supply from AC 90V-240V or 9V rechargeable battery (Not included). AV voltage: AV 9V-240V 50-60Hz Battery voltage: 9V rechargeable battery(Not included) Working temperature: 0-50degC Environment humility: 10%-95% Alarm density: 2500PPM(plusmn1500PPM) Alarm time: keep alarming after over 2500PPM Plug Type :EU Plug,it applies to Indonesia, , , , and so on. Voltage: AC90-240V Colour:White Material: ABS Size: 112 x 73 x 42MM Package Contents: 1 x Gas Detector Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.