Unauthorized certification marks were applied to carbon monoxide detectors and combined smoke and carbon monoxide alarms, which have not been evaluated by UL Solutions to the appropriate safety standards, posing potential risks to consumers.

NORTHBROOK, Ill.--(BUSINESS WIRE)--Dec. 9, 2025-- UL Solutions (NYSE: ULS), a global leader in applied safety science, issued public notices regarding the following products, which bear unauthorized UL certification marks and may pose safety risks:

- Gedsffati carbon monoxide alarm (product model HD08) and Gedsffati combined smoke and carbon monoxide alarm (product model HD11);

- HAKINAKU carbon monoxide detectors (product model HD09);

- and carbon monoxide detectors (product model HD10) sold by Shenzhen Huidu Technology Co. Ltd.

These products, sold under the brand names and product models mentioned above through Amazon.com, have not been evaluated by UL Solutions to the appropriate safety standards, and it is unknown whether they meet any safety requirements. UL Solutions recommends that these products be removed from service and immediately replaced with properly UL certified carbon monoxide alarms and combined smoke and carbon monoxide alarms.

The affected products bear an unauthorized UL certification mark. Additional product label details and images of these products can be found in the following public notices at UL.com:

- Gedsffati carbon monoxide alarm (product model HD08) and Gedsffati combined smoke and carbon monoxide alarm (product model HD11)

- HAKINAKU carbon monoxide detectors (product model HD09)

- Carbon monoxide detectors (product model HD10) sold by Shenzhen Huidu Technology Co. Ltd.

“The presence of unauthorized UL Marks on these devices is a serious concern,” said Karine Johnfroe, vice president and general manager of the Built Environment group at UL Solutions. “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.”

Since 1894, UL Solutions has been integral to enabling fire and life safety technology advancements. UL Solutions’ training, advisory, testing, inspection and certification services for fire, smoke and gas detection technologies help manufacturers bring compliant products to the market.

About UL Solutions

A global leader in applied safety science, UL Solutions (NYSE: ULS) transforms safety, security and sustainability challenges into opportunities for customers in more than 110 countries. UL Solutions delivers testing, inspection and certification services, together with software products and advisory offerings, that support our customers’ product innovation and business growth. The UL Mark serves as a recognized symbol of trust in our customers’ products and reflects an unwavering commitment to advancing our safety mission. We help our customers innovate, launch new products and services, navigate global markets and complex supply chains, and grow sustainably and responsibly into the future. Our science is your advantage.

UL Solutions public notice reference numbers: 24PN-44A, 24PN-44B, 24PN-44C

View source version on businesswire.com: https://www.businesswire.com/news/home/20251209931025/en/

Media contacts:
Tyler Khan
UL Solutions
ULNews@UL.com
T: +1 (847) 664.2139

Steven Brewster
UL Solutions
ULNews@UL.com
T: +1 (847) 664.8425

Source: UL Solutions