A carbon monoxide detector that fails to alarm is worse than no detector at all — it gives a false sense of security while a deadly gas builds up. The U.S. Consumer Product Safety Commission (CPSC) has issued urgent warnings against multiple combination smoke and carbon monoxide detectors sold on Amazon, Walmart, and other online platforms that fail to alert consumers to the presence of deadly smoke, fire, and carbon monoxide.
The TJTFJS Detector
CPSC has warned consumers to immediately stop using TJTFJS 2-in-1 CO & Smoke Detectors, model TJ00907, because they can fail to alert consumers to hazardous smoke and fire — meaning the alarm may never sound during an actual emergency. The detectors are made of white plastic with a digital display and were sold on Amazon.com, Walmart.com, Kmart.com, Sears.com, and Desertcart.com. The Chinese seller, guangzhouzhongbokejiyouxiangongsi, has been unresponsive to CPSC’s requests for a recall.
The JNHCD Detector
CPSC also warned against JNHCD Combination Smoke and Carbon Monoxide Detectors, which similarly can fail to alert consumers to the presence of fire — posing a risk of serious injury or death from smoke inhalation or burns. These were sold on Amazon.com by multiple third-party sellers.
The 4-in-1 Plug-In Detector
A third product — a 4-in-1 Plug-In Natural Gas and Carbon Monoxide Detector — was warned against by CPSC for failing to alert consumers to deadly carbon monoxide, including units sold in single and multipacks from June 2024 through July 2026 across Amazon.com, eBay.com, AliExpress, Microcenter.com, and Snapklik.com for between $13 and $140.
What Every Consumer Must Do
- Stop using any of the flagged detectors immediately and dispose of them.
- Replace them with detectors that carry genuine UL 2034 (CO) and UL 217 (smoke) safety certifications — verify these certifications independently before purchasing.
- Install working smoke alarms and CO detectors on every level of your home and outside every sleeping area.
- Use only battery-operated or battery-backup detectors.
- Test alarms monthly and replace batteries at least once per year.
- Purchase detectors only from established brands with verifiable U.S. safety certification — be especially cautious buying from unknown sellers on Amazon.
To report a dangerous product or a product-related injury, visit SaferProducts.gov or call CPSC’s Hotline at 800-638-2772.
