- About The Store
- Home Safety FAQs
- View Cart
The First Alert Long Life Battery Smoke Alarm features an extended long-life lithium battery that is warranted by the manufacture to ensure a decade's worth of protection! This effectively translates to ten years of constant and undisturbed coverage. Utilizing an Ionization Sensor, this alarm is especially effective in recognizing smoke brought on by flaming fires. This alarm comes equipped with a Mute Button that serves the dual purpose of quickly silencing your alarm as well as testing its function. First Alert's Long Life Battery Smoke Alarm also features an EZ access battery door that removes the hassle and burden of collecting your alarm from the ceiling and replacing its batteries. This alarm carries a 10-year limited warranty and meets UL217 Standards.
Ionization Sensor Reliably Detects Flaming Fires
The First Alert Long Life Battery Smoke Alarm comes equipped with an ultra-reliable ionization sensor to provide the earliest possible warning of a fast-flaming fire. The sensor is optimized to detect flaming fires, such as those caused by paper, kitchen grease, and other fast-combusting materials.
Battery-Powered Alarm Installs Easily
This battery-powered smoke detector requires no rewiring and no electrician to install. Simply mount it on a wall or ceiling using the open mounting design. An end-of-life signal will notify you when the detector is nearing expiration.
Test and Silence Button
Mute Button has been included to serve the dual purpose of silencing nuisance alarms and testing the functionality of your alarm.
First Alert Long Life Battery Smoke Alarm SA305CN3
* California Residents - Please Note This Alarm is Not Compliant with California State 10 Year Sealed Battery Alarm Legislation Requirements.
Average Rating Based on 42 reviews:
Well Designed & Reliable - 11/28/2018
Reviewer: Mark Andresky
We have been installing this model in most rooms of our home for many years--always reliable, easy to install, and usually lasts the full 10 years. Very economical as well compared to comparable models from other brands.
Reviewer: Linda Guillermo
Well Designed & Reliable - 05/04/2018
Reviewer: Mark Andresky
Have used this model throughout our home for many years. Reliable and easy to install. Small, unobtrusive design makes it less noticeable compared to competitive models.
Finally! Long life batteries - 02/08/2017
Reviewer: Cheryl Kucer
Tried to get these at local hardware stores & could only get three. So I went on first alert website, found the rest that I needed and ordered them. Prices were better than hardware store, easy to order and I got them right away. Very, very happy with first alert.
Great - 08/08/2016
Reviewer: Jessica Grignon
great smoke alarm
Rate of First Alert Alarms - 03/06/2015
Reviewer: Preston Pilcher
I have these alarms in my home and feel that FIRST ALERT Long Life Alarms are the BEST will use again!!!!
Reviewer: Thelma Blake
products are great, with the long life battery you can almost forget about them.
Reviewer: Joseph Wade
Looks like a winner.
smoke - 04/01/2014
Reviewer: Geor McGonigle
fast delivery easy to install
Reviewer: Gerald Darnell
I purchased 8 on these. Good value and timely delivery
Actual battery service life depends on the particular design of your smoke or carbon monoxide alarm and the environment in which it is installed. All kinds of alarm batteries specified in the user's manual are acceptable replacement batteries. Regardless of the manufacturer's suggested battery life, you MUST replace the batteries immediately once the unit starts "chirping" (the "low battery warning"). It is recommended that you change the batteries in your alarms when you change your clocks for daylight saving time. Also consider replacing your current alarms with 10-Year Life Alarms that never require a costly battery replacement for the ten year life of the alarm. This 10-Year series is available in smoke, carbon monoxide and combination alarms.
Other reasons include: It could be a different device or appliance such as a security system, monitor, carbon monoxide alarm, or other device which has a similar low battery or alert signal. Some of the same factors that cause unwanted alarms can cause intermittent alarms: dust and insects in the alarm or power interruptions in hardwired alarms. Improper wiring on AC or AC/DC smoke alarms. AC alarms will chirp every 5 seconds if the interconnect wire is grounded. The orange interconnect wire should NEVER be grounded; it should only be used to interconnect other smoke alarms or compatible devices.
We make it as easy as possible to ensure you get the lowest prices available: