Smoke alarm with dual sensing technology and nuisance resistance utilizes two different technologies capable of quickly deciphering between flaming and smoldering fires. Equipped with dual photoelectric and ionization smoke sensing technologies. A single button silences and tests the smoke detector for simple operation. Battery powered， easy to install anywhere， no wiring required. Battery life varies according to use and application. UL (Underwriter's Laboratories) listed. **NOT Available in IL.**