A white circular smoke detector with vents and LED indicators, red and black wires protruding, photographed on a plain white background, ready for ceiling installation.

120 V AC Smoke Alarm with 9 V Battery Backup

i12040-CA

The Kidde i12040CA is a 120 V AC, wire-in smoke alarm with 9 V battery backup that can function as a stand alone unit or interconnect with up to 24 Kidde devices (of which 18 can be initiating). The Kidde i12040CA provides continuous protection against smoke and fire hazards, even during power outages.

  • Ionization Technology

  • 120 V AC Direct Wire • Interconnects with up to 24 devices

  • Test / Hush® Button

  • 9 V Battery Backup

Helpful Resources
A white circular smoke detector with vents and LED indicators, red and black wires protruding, photographed on a plain white background, ready for ceiling installation.
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A smoke alarm is being installed, hands connecting wires to a ceiling junction in a bright, plain-room interior, a man reaching upward to secure the device.
A red fire extinguisher stands upright beside smoke and carbon-monoxide alarms and packaging, arranged on a light wooden table against a pale wall with a large red "#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.