The Apple Watch’s sensor may hold more health monitoring functions than Apple has revealed, including measuring blood oxygen levels, a feature that’s not enabled on the device and that Apple hasn’t talked about.

That’s one of the findings from iFixIt, which disassembled an Apple Watch Sport Edition on the day the wearables started shipping to customers.

U.S. government regulations may prevent Apple from allowing the watch to capture blood oxygen data, according to iFixIt, whose website lets people offer each other advice on how to fix a variety of things, including computer hardware. The site is also known for breaking apart Apple’s new products as soon as they go on sale.

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