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Two Oura users reported their rings smoking and overheating.
Smart rings are built with lithium-ion batteries.
They may overheat if damaged or improperly charged.
Smart rings have had some bad press recently. Earlier this year, a Samsung Galaxy Ring began swelling on a user's finger as he was about to board a flight. And last week, two Oura Ring users reported their rings were overheating and smoking.
A user on the Oura Ring Reddit reported that their ring began smoking and burning their finger on a morning walk. The user felt a burn on their finger, attempted to get the ring off quickly, and developed a blister upon removal.
Also: This new $75 smart ring helps you remember the things you'd likely forget
"My hand smells like electronic fire," the user wrote. They said they'd worn the smart ring for four to five months when they experienced the smoking ring. Another user, in a now-deleted thread, said the smart ring was defective upon purchase.
"We take any safety-related report seriously and are actively reviewing the recent posts on a case-by-case basis. While Reddit discussion threads can create the impression of scale, the two reported cases appear to be isolated incidents rather than a wider pattern, and we're conducting thorough investigations -- including third‑party analysis -- to understand exactly what happened and support the members involved," an Oura spokesperson said in an email to ZDNET. For context, Oura has sold over 5.5 million rings since September this year.
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