The Oura Ring emits minimal electric and magnetic fields (EMFs) and allows you to enable Airplane Mode to limit contact even further.
The limit for SAR (Specific Absorption Rate) for a device such as the Oura Ring is 2.0 W/kg for head and body. The Oura Ring SAR level is 0.0003 W/kg.
Additionally, Bluetooth is only active on the Oura Ring for short periods of time, well below 1% of the day. Data is transmitted more continuously when the ring syncs with the app and during firmware updates.