The SOE-24 Series of detectors are reliable, high-quality, UL 268 7th Edition listed Photoelectric Smoke Detectors allowing them to be used in all open areas where smoke detection is required. The SOE-24V is a photoelectric only detector. The SOE-24H is a combination smoke and UL 521 7th Edition listed heat detector. The new multi-spectrum smoke categorization technology detects smoldering and flaming fires, including polyurethane fuels, while reducing nuisance cooking alarms.