Andy O'Donoghue

They've got a big kind of celeb launch.

They've done really well.

And one of the things about them is because smart rings measure signals directly from the finger, where blood flow is often easier to detect than at the wrist, many users find the sleep and recovery data really accurate.

And that's kind of a difference about these.

The Oura Ring, very well made.

They're expensive.

They're about 400 euros.

You can get them in various sizes.

If anyone's looking at them, get the sizing kit first.

You try the sizing kit, you get it sized up, and then they send you your correct size.

Really important that you do that.

The membership isn't bad if you subscribe.

It's about €6 a month for the full functionality, but it has eight days battery life.

And you get blood oxygen level, daytime stress, and you get female health metrics as well.

Incredibly popular.

An alternative, though, I would say, is have a look at the Ultra Human Ring.

And that's just been launched, the new version of that, which is called the Air.

€379, but...

It gives you all that data, again, like you just said, without the subscription.

So once you buy the ring, the app and all the insights are completely free forever.