Wearable health tracker Oura Ring with state of the art pulse, sleep, stress, readiness tracking. You will need to buy a charger separately, as I have an upgraded ring that I'm keeping. Battery life needs a charge every 2-3 days, but it charges quickly. I have worn this every day for 16 months, so there is normal wear and tear on the bottom surface of the ring (see video). The top is shiny and has no flaws.