SITERWELL Hardwired Interconnected Smoke Detector with Photoelectric Sensor, 9V Battery Backup, Test and Silence Button, ETL 9th Listed, Pack of 4, GS562A Category Home Appliances Small Appliances Coffee & Beverage Machines Drip Brewers Perculators The interactive features such as VIP786402256060MN The interactive features such as gear shifting providing convenient water drainage control Do Not Disturb Mode: Temporarily silences low voltage or fault alerts for up to ten hours to prevent frequent alarms and maintain restful sleep Photoelectric Sensor Technology: Quickly detects smoke from smoldering fires while minimizing false alarms caused by cooking or steam