I’d be interested to see a battery-less ring that uses the mechanical energy of the press to power a BLE transmitter to trigger voice input on a watch. I feel like it’s much safer, plus it has no fixed lifespan.
I suggesting triggering input on a watch, not voice recording on the ring. In my suggestion the ring would be a ‘dumb’ input device.
Your use case would be another product, likely with a different audience.