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This First Alert Battery-Powered Smoke Alarm with a Silence Button Sa303cn4 will help to keep homes safe with an operation you can depend on. It is simple to keep it going as needed. The ionization sensor smoke alarm is easy to install for your convenience. It emits a loud, 85dB alarm sound when smoke levels are elevated, ensuring that the family can hear it as needed. It's recommended to have one in each room for optimal safety. This tamper-resistant smoke alarm will provide continuous operation, even in the event of a power outage. It has a light color that will blend with your ceiling. The First Alert Battery-Powered Smoke Alarm with a Silence Button Sa303cn4 has been tested to meet UL standards.