UL Solutions Issues Safety Warning on Unauthorized UL Marks Found on Multiple Carbon Monoxide and Smoke Alarm Devices
UL Solutions, a global leader in applied safety science, has issued a series of public safety notices alerting consumers to several carbon monoxide (CO) detectors and combined smoke and carbon monoxide alarms that bear unauthorized UL certification marks. These products—sold on Amazon.com under various brand names and model numbers—have not undergone the necessary safety evaluations by UL Solutions, raising concerns about their reliability and potential safety risks. The company is urging consumers to remove these devices from service immediately and replace them with properly certified alarms.
Unauthorized Products Identified
The public notices highlight multiple products that are falsely displaying the UL Mark, suggesting compliance with safety standards they have not been tested against. The affected devices include:
- Gedsffati carbon monoxide alarm (model HD08)
- Gedsffati combined smoke and carbon monoxide alarm (model HD11)
- HAKINAKU carbon monoxide detector (model HD09)
- Carbon monoxide detectors (model HD10) sold by Shenzhen Huidu Technology Co. Ltd.
These devices were sold primarily through Amazon.com and marketed under the brand names and product models listed above. None of these alarms have been evaluated by UL Solutions to confirm their safety or performance. As a result, it is unknown whether the devices meet any essential safety requirements for detecting life-threatening levels of carbon monoxide or providing adequate smoke detection.
UL Solutions stresses that carbon monoxide and smoke alarms are critical life-safety devices. Any product lacking proper third-party safety certification poses substantial risk, as failure to detect hazardous conditions can result in severe injury or death.
Unauthorized Use of UL Certification Marks
Each of the listed products bears what appears to be a UL certification mark, but UL Solutions has confirmed that these marks are not authorized. Unauthorized marks can mislead consumers into believing that products have been rigorously evaluated and certified according to UL safety standards, when in fact they have not undergone any formal assessment.
To help consumers identify the affected products, UL Solutions has provided additional images and detailed labeling information through official public notices published on UL.com. These notices cover the specific models:
- Gedsffati HD08 and HD11
- HAKINAKU HD09
- HD10 models sold by Shenzhen Huidu Technology Co. Ltd.
UL Solutions encourages consumers, retailers, and distributors to review these public notices to ensure the products are not being used or offered for sale.
Karine Johnfroe, vice president and general manager of the Built Environment group at UL Solutions, emphasized the seriousness of the situation.
“The presence of unauthorized UL Marks on these devices is a serious concern,” Johnfroe said. “We urge anyone who has purchased these devices to remove them from service and immediately replace them with properly UL certified carbon monoxide alarms and combined smoke and carbon monoxide alarms.”
Johnfroe noted that unauthorized certification marks undermine consumer trust and create dangerous situations in homes and workplaces. CO alarms and smoke detectors must operate reliably, and certification helps ensure that products meet strict standards for hazard detection, durability, and performance.
Why Certification Matters
Carbon monoxide is an odorless, colorless gas that can be lethal even at low levels of exposure. Smoke detection, likewise, plays a critical role in early fire detection and evacuation. Proper certification verifies that alarms respond accurately and promptly under a range of testing conditions.
UL Solutions is one of the most recognized names in product safety certification, with decades of experience evaluating fire protection, gas detection, and life-safety technologies. Certified alarms undergo rigorous testing to confirm they activate correctly, withstand environmental conditions, and meet performance requirements set by national and international safety standards.
Products lacking certification may fail to detect dangerous conditions or may malfunction, leading to delayed warnings or false assurances of safety.
UL Solutions’ Longstanding Role in Fire and Safety Technology
Since its founding in 1894, UL Solutions has played an integral role in advancing fire and life-safety technologies worldwide. Through its extensive portfolio of services—including training, advisory support, testing, inspection, and certification—the organization helps manufacturers produce compliant, high-quality safety devices. Its standards and protocols form the foundation of industry expectations for smoke alarms, CO detectors, and other critical safety equipment.
With more than a century of leadership in the safety science domain, UL Solutions continues to work with manufacturers, regulators, and consumers to ensure that products entering the marketplace meet essential safety benchmarks. Its certification mark remains one of the most trusted indicators of product compliance and reliability.
Consumer Guidance and Next Steps
Consumers who have purchased any of the identified products should take immediate action:
- Remove the alarm from service—Do not rely on the device for safety.
- Replace with a UL-certified alarm—Look for authentic UL certification, typically accompanied by a control number.
- Review the UL public notices—Visit UL.com for detailed product images and label descriptions to verify whether your device is affected.
- Notify the seller or retailer—Report unauthorized use of UL marks to help prevent further distribution.
UL Solutions is actively working with online marketplaces and retailers to remove the listed products from sale and ensure consumers are informed about the potential risks.
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