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Your cart is empty.The product is a hardwired alarm, also confirm if the wiring polarity is correct and that all wire nut connections are secure. A loose neutral (white wire) connection within the home junction box could prompt a device malfunction. Promote greater household safety with the First Alert 9120B Hardwired Smoke Alarm with Battery Backup. This 120-volt AC smoke detector uses an ionization smoke sensor to reliably detect smoke from hot, fast-flaming fires and alerts you with a loud 85-decibel alarm.
Tilley
August 25, 2025
Easy to install
R. Pound
June 24, 2025
Easily replaced and work perfectly.
M. T. Sarantakos
June 2, 2025
excellent. Easy to install. Good value for money.
Peg Frenze
May 29, 2025
It works well however I wanted a combination smoke alarm and carbon monoxide detector that I previously had but was sent just the smoke detector
archnmia
April 5, 2025
Good product, fair price, great service.
Chuck D.
March 20, 2025
This is not a direct replacement for the Sentry product and claiming so is false. The Sentry product also had a carbon monoxide detector built in and this product does not. I’m sending it back. The sentry product was more expensive and this company sent me 3 for the price of the Sentry.
dh
January 26, 2025
Purchased these as replacements for original ones that were in a 2019 manufactured home I purchase for my daughter. Ended up being exact replacement for what was there so installation couldn't have been easier. Even used originally installed mounting brackets.
Rosellen
January 24, 2025
Very pleased with the product. Already have all 3 up works great.
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