system sensor 2wt-b for sale, brand-new and used.

New in box, pictured here, the best central monitored smoke detector with built in thermal heat detector so will trigger if temperature hits 135 degrees Fahrenheit even without smoke getting to it (such as when fire on upper floor, wind is blowing smoke other direction, etc). Have (2), auction is for (1), winner can buy other one if wanted if we discuss and I will invoice for one same shipping both items.