erohead parent
If you look at other rechargeable smart rings they're in the $250 to $300 range, plus a $10/month subscription. We didn't want to do that for a new product like this.
I like the price here, but my question was not about adding charging circuitry, but some way to open the ring and replace the battery once it's depleted.
Then you'd run into waterproofing issues, and there's greater inherent complexity in providing replacement ability.