The Siterwell Smoke Alarm & Detector GS562A is a set of two white smoke alarms powered by batteries with a backup option. The alarms feature a photoelectric smoke sensor, making them efficient in detecting smoke quickly. With a manufacturer warranty of 10 years, these alarms provide safety and peace of mind for your home. Compatible with Google Home for added convenience, these smoke alarms from Siterwell are a reliable and essential addition to any home security system.