On October 29, 2026, the U.S. Consumer Product Safety Commission (CPSC) issued two product safety warnings about combination smoke and carbon monoxide (CO) alarms sold online. According to CPSC, both models can fail to alarm in the presence of hazardous smoke and fire, posing a risk of serious injury or death.

The two alarms in the warnings

Model JZA-540COM (JuzhiAnn, Yfwsrecinoe and JAEHSKA brands). About 51,825 units were sold on Amazon.com and eBay.com from November 2023 through October 2026 for between $11 and $107. CPSC is aware of seven reports of the alarms failing to alert in the presence of smoke or fire. (CPSC warning 27-052)

Model YHW-542COM-R (GuardianSense and KLTseanife brands). These were sold on Amazon.com and eBay.com from September 2025 through June 2026, in single units and multipacks, for between $18 and $168. CPSC cites two reports of the alarms failing to alert in the presence of smoke or fire. The model number and manufacturer are listed on the back of the unit. (CPSC warning 27-057)

Both are white plastic combination alarms with a digital display.

Why this is a warning, not a recall

CPSC says the companies behind these alarms did not respond to its requests to recall them. That means there is no refund or replacement program, and no letter is coming. If you have one of these alarms, the next step is up to you.

What to do

  • Take down any combination smoke/CO alarm you bought online and check the model number on the back.
  • If it is model JZA-540COM or YHW-542COM-R, stop using it and dispose of it. Do not sell or give it away.
  • Replace it right away so there is no gap in protection. CPSC says to buy only alarms that meet UL 217 (smoke) and UL 2034 (carbon monoxide).
  • Put smoke alarms and CO detectors on each level of the home and outside separate sleeping areas. Use battery-operated units or units with battery backup, test them frequently, and replace batteries as needed.

A heating-season reminder

With furnaces, boilers and space heaters running again, November is a good time to test every alarm in the house. If an alarm is mounted high, hard to reach, or needs to be replaced across several rooms, a handyman can help with the install. If a CO alarm sounds or anyone in the home feels sick, get outside to fresh air and call 911.

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Questions about this topic

Which smoke and CO alarms does CPSC warn about?

Two combination smoke and carbon monoxide alarm models: model JZA-540COM, sold under the JuzhiAnn, Yfwsrecinoe and JAEHSKA brand names, and model YHW-542COM-R, sold under the GuardianSense and KLTseanife brand names. Both are white plastic units with a digital display, sold on Amazon.com and eBay.com as single units or multipacks.

How do I check whether I have one of these alarms?

Take the alarm down and look at the label on the back for the model number. For the GuardianSense/KLTseanife units, CPSC says the model YHW-542COM-R and the manufacturer are listed on the back of the product. You can also check your Amazon or eBay order history for these brand names.

Is there a refund or replacement?

No. These are CPSC product safety warnings, not recalls. CPSC says the sellers and manufacturer did not respond to its request to recall the products, so there is no company refund, repair or replacement program.

What should I do with an affected alarm?

CPSC urges consumers to stop using the detectors immediately, dispose of them, and install working smoke alarms and CO detectors. Do not sell or give them away.

What should I look for in a replacement alarm?

CPSC says to buy only smoke alarms and CO detectors that meet the UL 217 (smoke) and UL 2034 (carbon monoxide) safety standards, to use battery-operated units or units with battery backup, and to install them on each level of the home and outside separate sleeping areas.