Feature:1. Plug in-gas and carbon monoxide detector. This 2-in-1 gas detector contains a catalytic combustion sensor and an electrochemical sensor for sensitive sensing and high accuracy, protects you and your family from deadly threats.2. When flammable gas leaks or carbon monoxide exceeds the standard, this gas detector will alarm and voice reminding, allowing you to quickly determine and make the right choice, the LED screen will show the concentration. It can help reduce your worries about accidentally turning on your stove gas or having too much carbon monoxide.3. Simply plug-in to a standard, 120V outlet in your home or use 9V rechargeable battery (not included). In the event of a power outage, the 9V rechargeable backup battery will automatically kick. In to continuously protect your home.4. This machine can detect both carbon monoxide and combustible gases. Combustible gas detection range: methane, natural gas, coal gas, gas fuel, artificial gas, liquefied petroleum gas, liquefied natural gas etc. Each gas stove will have a protective device, please pay attention to whether natural gas overflows during testing. If it doesn\u0027t overflow, of course the machine won\u0027t alarm.Specification:The independent gas and carbon monoxide gas composite alarm is controlled by a microprocessor and characterized by stable operation, sensitive response, small size, and simple installation, which can be used in places where carbon monoxide (gas) may leak, to avoid dangerous accidents and ensure personal and property safety. Features:Plug in-gas and carbon monoxide detector. This 2-in-1 gas detector contains a catalytic combustion sensor and an electrochemical sensor for sensitive sensing and high accuracy, protects you and your family from deadly threats.When flammable gas leaks or carbon monoxide exceeds the standard, this gas detector will alarm and voice reminding, allowing you to quickly determine and make the right choice, the LED screen will show the concentration. It can help reduce your worries about accidentally turning on your stove gas or having too much carbon monoxide.Simply plug-in to a standard, 120V outlet in your home or use 9V rechargeable battery (not included). In the event of a power outage, the 9V rechargeable backup battery will automatically kick. In to continuously protect your home.This machine can detect both carbon monoxide and combustible gases. Combustible gas detection range: methane, natural gas, coal gas, gas fuel, artificial gas, liquefied petroleum gas, liquefied natural gas etc. Each gas stove will have a protective device, please pay attention to whether natural gas overflows during testing. If it doesn't overflow, of course the machine won't alarm.Specifications:Model: KH-522Material: ABSPower Supply Mode: DC9V alkaline battery backup when plugged in or powered offAlarm Current: <120 (mA)Operating Temperature: -20~50Moisture Determination Range: 15%~90%RHAlarm Decibel: >85dBExecution Standard: GB15322.5-2003Operating Instruction: The green indicator is always onCarbon Monoxide:The alarm will sound within 60~90 min when the concentration display value is 50PPM;The alarm will sound within 10~40 min when the concentration display value is 100PPM;The alarm will sound within 1 min when the concentration display value is ≥ 200PPM;Item Size: 127 * 74 * 60mm / 5 * 2.91 * 2.36inItem Weight: 123g / 4.33ozPackage Weight: 161g / 5.67ozPackage Size: 13.5 * 8.5 * 7.5cm / 5.31 * 3.34 * 2.95inPackage List:1 * Gas and CO Combination Alarm1 * User Manual (English)Package List:Package List:1 * Gas and CO Combination Alarm1 * User Manual (English)