The LE-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 LE-SOE-24V is a photoelectric only detector. The
LE-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.