From our top picks：SR-821THS comebined smoke detector co detector. Carbon monoxide and fire can make for a deadly duo, but SUMRING makes it easier to protect yourself against both. So our SR-821THS this carbon monoxide detectors also pull double duty as smoke alarms.
here are the product Description of the smoke detector co detector：
Fire smoke Detector with lcd display – When the unit detects the smoke concentration over than 0.1%db/m,it will alarm,the blue light flashes rapidly and the buzzer continue alarming.
Carbon monoxide Alarm with lcd display – When the unit detects the carbon monoxide gas concentrations more than 100 PPM,it will alarm,and the buzzer will make sound “di” four times at every 5 seconds,the red light flashes,and continue alarming.
Since these units are battery-operated and not hardwired, they’re easy to install in any location regardless of existing wiring.
Sources of CO in our homes include fuel-burning appliances and devices such as: Clothes dryers,Water heaters,Furnaces or boilers,Fireplaces, both gas and wood burning,Gas stoves and ovens,Motor vehicles,Grills, generators, power tools, lawn equipment,Wood stoves,Tobacco smoke
Similarly, fires in the home are also common, like electrical equipment, due to overloaded operation, short circuit, poor contact. and dry firewood, wood, woodware, fried food or other substances in the stove or flue may be cased fire.
So if you want to get double life and property protection, this comebined smoke detector co detector is the good choice.