Durable Material: This product is made of high-quality material, which is durable, has a long service life, and is firm and stable to use. Carbon monoxide detector alarm: suitable for all fields: residential, shops, hotels, restaurants, office buildings, schools, banks, libraries, computer rooms, warehouses, etc. Alarm standard and liquid crystal display: The alarm time depends on the level of carbon monoxide concentration. The carbon monoxide alarm display screen can accurately measure the carbon monoxide concentration and its concentration data. Carbon monoxide smoke detectors will notify you immediately when concentrations reach a certain level, minimizing false alarms Combo Alarm: A battery powered combo alarm that provides protection against the dual hazards of smoke and carbon monoxide in a single unit for added convenience - the voice alarm feature provides an audible notification of which hazard has been detected to protect the lives of your family and property safety from CO