USI Battery Operated Smoke Alarms expand the number of installation options by bypassing the traditional hardwired setup. Available as standalone and combination alarms, USI Battery Powered Smoke Detectors offer a wealth of versatility. Universal Security Sensing Plus Alarms use multi-criteria detection that’s capable of identifying both types of fires (fast flaming and slow smoldering). Sensing Plus Smoke Alarms also implement 10 year permanent power via the use of a lithium-free battery. This selection of battery powered smoke alarms conform to UL 217 Standard 8th Edition and UL 2034 Standard 4th Edition. These standards are set to be introduced on June 30th, 2022. Bring your home up to code while protecting your surroundings from the many dangers linked to the undetected presence of smoke and fire.