Round smoke detector displaying a green indicator light, a small metal test button and ventilation slits — close-up view mounted on a white ceiling.

AC Hardwired Interconnect Photoelectric Smoke Alarm with Hush™

P12040

The Kidde P12040 is a 120VAC powered photoelectric smoke alarm with 9V battery back up. This advanced smoke alarm has the ability to function as a stand-alone unit or in an interconnected system.

  • 120V AC Photoelectric Smoke Alarm

  • One button design (operates Hush™ and test).

  • 9V Battery Backup (included).

  • Tamper resist feature.

Helpful Resources

Upgrade to

This model is to be replaced with 20SAR

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A round Kidde smoke alarm shows a steady green LED, its vents and red/black wiring visible; photographed close-up against a dark background, suggesting ceiling-mounted installation.View Product
Round smoke detector displaying a green indicator light, a small metal test button and ventilation slits — close-up view mounted on a white ceiling.
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Helpful Resources

Click on the video to learn more about how to install your Kidde Smoke alarm.

Helpful Resources
Download iconProduct Data Sheet
Download iconUser Guide
Download iconSupport
Man installing a safety device on his ceiling.Play button
A red fire extinguisher and three Kidde smoke/CO detectors (one boxed) stand arranged on a light wood tabletop against a pale wall, accompanied by a round "#1" safety-brand badge.

Why Kidde

As North America's #1 home fire safety brand,* Kidde has been working to help make your home the safest it can be for more than 100 years. Now, our latest smoke alarms and combination smoke + carbon monoxide (CO) alarms are bringing you the next level of fire and CO safety. Help protect what matters most in your life with features like cutting edge technology that send fast alerts to give your family more time to get out safely. And enhanced sensing technology that reduces false alarms often caused by cooking.

*Based on total household installations as of December 2023.