This was the Ringconn 2 - they just came out with version 3 which supposedly does blood pressure too.

Before I bought, I looked a lot into the Oura ring which seems mighty posh but... I just couldn't get over the subscription aspect of it.

And yeah I remember first hearing about them and just kind of wafting the idea away but it's so less intrusive than a watch. More importantly I want my watch to be a proper analogue watch that just looks good instead of making me look like some Apple iDouche haha (no offence; statistically speaking you're an Apple product user =P)

The wallet ring is totally new to me and would probably be super easy to implement in such miniaturised form, just one tiny chip, I suppose. Cool!