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First Alert SA303CN3 Battery Powered Smoke Detector

Post Updated June 6, 2026 by Perry Penn

The First Alert SA303CN3 is made by the most trusted home safety brand in the country. It is a battery powered smoke alarm that comes with a silence button and will not sound as a result of shower steam or cooking smoke. It comes with an easy battery test, which requires the press of just a single button.

First Alert SMI100 Smoke Alarm, Battery-Operated Detector with Test & Silence Button

First Alert SMI100 Smoke Alarm, Battery-Operated Detector with Test & Silence Button

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It features a front loading battery door, which is very easy to access and means that you don’t have to take the alarm down every time you need to change the battery. It is perfect for living areas, bedrooms, hallways, and anywhere else in the house. It also meets the relevant UL standards and comes with a 10 year warranty.

Key features include:

– Easy access to the battery container through a front loading door
– A mute button
– An ionization smoke sensor
– The opportunity to lock secure it, thereby preventing theft
– A loud alarm, sounding at 85 dB
– A 9V battery
– Meets UL217 safety standards, the international standard for smoke alarms
– Made by First Alert, the most recognized and trusted home safety brand in the country

Clearly, this smoke alarm is all you will need to keep yourself and your family safe and give you plenty of warning if there is a fire.

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