Did FDA clear the whole RingConn ring as a medical device?

The FDA listing for K260490 classifies the device as an oximeter, Class II, so the cleared function is blood oxygen measurement. Neither the release nor the listing describes the rest of the ring as a medical device.

Can consumer wearable data support an SpO2 510(k)?

The accepted method is a controlled desaturation study comparing the device against arterial blood samples. FDA's January 2025 draft guidance allows real-world data only in certain cases.

Does an FDA clearance change the FCC authorisation?

No. FCC equipment authorisation is a separate legal requirement. The RF and EMC work now also feeds the medical device risk file.

Does an FDA 510(k) clearance count towards a CE mark in the EU?

No. A 510(k) is not recognised in Europe, though the US study data can feed the EU clinical evaluation. Sell the ring in the EU as a medical device and the Medical Device Regulation applies: its own clinical evaluation and a notified body. Sell it as a wellness ring under the Radio Equipment Directive and it stays outside. Plan one study for both markets.

Insights & analysis

US · FDA 510(k)22 October 2026·3 min read·Paal Selnaes

One function, one study: what RingConn's FDA clearance says about the data moat

A consumer ring's SpO2 clearance is a prompt to look at how wearables reach FDA: one narrow function, purpose-built clinical evidence, and hardware that has to stay still afterwards.

In April we argued that a mountain of wellness data is not a ticket into regulated medicine (The Data Moat That Isn’t).

On 10 October, RingConn announced FDA 510(k) clearance for blood oxygen on its smart ring. Here is what that buys, and what it costs.

The route, in four numbersOne function, not the whole ring

1functionBlood oxygen, cleared as an oximeter, Class II
1studyReadings checked against arterial blood. Wellness data can't stand in
150subjectsFDA's draft minimum, a quarter in each of three skin-tone groups
3gatesFDA for the function, FCC for the radio, Medical Device Regulation (MDR) for Europe

One function, not a medical ring

The FDA listing for K260490 classifies it as an oximeter, Class II. Neither the release nor the FDA listing describes the rest of the ring as a medical device. The detailed summary is not public yet.

It is a well-worn playbook. Apple’s ECG app (2018). Samsung’s sleep apnea feature (2024), which then became the predicate for Apple’s. Masimo W1 for SpO2 (2023). Movano’s EvieMED ring (2024). Under FDA’s multiple-function policy, the agency reviews the medical function and checks that the rest does not interfere with it.

What an SpO2 claim needs

The data does not clear the device. A study does.

The test is a controlled desaturation study: volunteers breathe thin air under supervision while the device is checked against arterial blood. No wellness archive has the blood. FDA’s January 2025 draft guidance raises the bar to 150 people across three skin-tone groups. For scale, EvieMED’s summary reports 816 pooled samples.

We’ve worked on an SpO2 sensor for another product, and accuracy on darker skin tones was one of the hardest problems to solve. Oximeters compare red light (about 660 nm) with infrared (about 940 nm). Melanin soaks up more red, so the red signal sinks towards the noise. Calibrate mostly on lighter skin and readings run high: in hospital data, Black patients had nearly three times the rate of missed low oxygen. On the board, that is LED current against the battery, the photodiode and AFE you pick, and how well the optics sit on the finger.

Why bother clearing it?

Since January 2026, a wellness ring can already show an SpO2 number (Reuters). Clearance buys the right to make a medical claim about it, and a product hospitals and remote-monitoring programmes can actually buy. It also buys obligations.

Back to the board

A cleared function lives inside a quality system: FDA’s QMSR since February 2026 — ISO 13485, with risk management (in practice ISO 14971) — plus the IEC 60601 family and ISO 80601-2-61 for oximeters.

The real shift is change control. LEDs, photodiode, AFE, the mechanical stack and the firmware are now part of a cleared device. A change that “could significantly affect the safety or effectiveness of the device” needs a new 510(k). An LED end-of-life notice becomes a regulatory event. Qualify second sources before you need them.

The radio does not change. FCC is a separate gate, and the RF and EMC reports simply gain a second home in the risk file.

The other direction

A 510(k) is not recognised in Europe, though the US study data can feed the EU clinical evaluation. Sell the ring in the EU as a medical device and the Medical Device Regulation (MDR) applies: its own clinical evaluation and a notified body (MDCG 2021-24). Sell it as a wellness ring under the Radio Equipment Directive and it stays outside. Plan one study for both markets.

US · FDA 510(k)One function, cleared on its own studyDesaturation study · QMSR change control · FCC unchanged

EU · MDRA 510(k) is not recognisedOwn clinical evaluation · notified body review

What next

Our bet: more brands will take one familiar function, SpO2 or heart rhythm, through 510(k) on an existing predicate. The rest will stay wellness-only. FDA’s final oximeter guidance will set the price of entry.

An update to April

FDA closed the July 2025 WHOOP warning letter we cited, in June 2026, after WHOOP changed the feature (MedTech Dive). The wellness guidance also moved in January. The thesis holds: data does not clear devices. Studies do, one function at a time.

Taking a wearable from Europe to the US, or the other way? The expensive mistakes are made on the board, before the study. That is our work, alongside your engineers. See how we work or talk to us.

Nothing here is regulatory advice. Facts checked as at 22 October 2026.