Oura Health
Oura said the deal could provide new opportunities in payments and data security.
Instead of taking their temperatures manually, users can sync data from the Oura Ring to help determine fertility.
Also, Oura and Truepill make announcements.
Features on the Oura Ring Generation 3 at launch include heart rate tracking, improved temperature monitoring and period prediction.
The round was led by the Chernin Group and Elysian Park.
In a survey from Philips published earlier this year, 44% of adults said their sleep had worsened in the past five years.
The Finnish company now enjoys support from several tech founders, athletes, and celebrities.