Carbon Monoxide Detector + Smoke Fire Alarm - Combo CO Detector & Smoke Sensor Alarm Sound Photoelectric Tester, Battery Operated with Digital Display for CO Level (White)Category: Temperature Combo SensorIt is toxic to hemoglobic animals (including humans) when encountered in concentrations above about 35 ppm, although it is also produced in normal animal metabolism in low quantities, and is thought to have some normal biological functions. In the atmosphere, it is spatially variable and short lived, having a role in the formation of ground-level ozone.|This battery-operatedFeatures:This standard size portable carbon monoxide (CO) & smoke combination alarm monitors the air for the presence of CO or for a potential fire. The alarm will generate loud sound alarm and accompanied by the flashing red LED light when elevated CO level is detected or there is a potential fireThe alarm will emit four short alarm beeps when Carbon Monoxide is detected and will emit continuous beeps when smoke is detected. The alarm will also emit continuous beeps when both smoke and carbon monoxide are detected at the same timeTest/Reset Button - Tests units electronic circuitry and horn and resets the unit during alarm; display shows the level of carbon monoxide the unit is sensingAlarm Memory Peak Level Button - Displays the peak CO level recorded by the alarm since it was last reset or unpluggedFlexible placement for universal safety application: such as installation for rv, travel trailer, boat, , home, house, natural gas detection, truck, car, garage, bathroom, kitchen area, household, office, warehouse, etc...Green LED: The green LED flashes every 30 seconds to indicate the unit is operating properly.Red LED: When a dangerous level of carbon monoxide is detected and a potential fire isdetected, the red LED will flash and the alarm pattern will sound.Power Supply: one 9V alkaline 6LR61 or carbon zinc battery 6F22Sensitivity Setting:CO: sensitivity & time50ppm: alarms with 60-90 minutes100ppm: alarms with 10-40 minutes300ppm: alarms with 3 minutesSmoke: 1%~5%/FT OBSStandby current: Alarm Current: Operation Ambient Condition: 5~400C, 20~90% R.H.Package Content:1x Carbon Monoxide Detector + Smoke Fire Alarm - Combo CO Detector & Smoke Sensor Alarm Sound Photoelectric Tester, Battery Operated with Display for CO Level (White)A smoke detector is a device that senses smoke, typically as an indicator of fire. Commercial security devices issue a signal to a fire alarm control panel as part of a fire alarm system, while household smoke detectors, also known as smoke alarms, generally issue a local audible or visual alarm from the detector itself. Smoke can be detected either optically (photoelectric) or by physical process (ionization) method. Sensitive alarms can be used to detect, and thus deter, smoking in areas where it is banned.|Carbon monoxide (CO) is a colorless, odorless, and tasteless gas that is slightly less dense than air.