What a great smoke CO combo alarm !

As the name suggests：smoke co combo alarm is a safety equipment that can detect both smoke and CO gas. Detection of multiple threats all in one alarm, combination smoke co detectors help protect homeowners from smoke, fire, carbon monoxide.

Such as our smoke co comb detector SR-821THS, the product is a 3*1.5V AA battery operated and install easy without wire.
Get two times the protection from one reliable alarm.
Carbon monoxide and fire can make for a deadly duo, but Sumring makes it easier to protect yourself against both. smoke co combo alarms have sensing technologies that work together to detect fires and the odorless, colorless, tasteless gas known as CO – the silent killer. 

With a unique structure design and an intelligent MCU to process photoelectronic signals, it is provided with dust-proof, mothproof and anti-light interference etc. functions, ensuring the detector stability from design basis and suitable for all kinds of installation environments. It reacts very quick to visible smoke released by smoldering fire and flaming fire and with accurate CO concentration LCD display, and suitable for house, factories, shopping malls, hotels, restaurants, office buildings, teaching buildings, banks, libraries, warehouses, etc..

Hope you like this combination smoke co detector，more detail, more lower price，more high quality, please contact us!