One plus 3T - Manual (Page 31)

31 | What’s in the Box Device OxygenOS Safety Information
CE Information (SAR)
The SAR limit of Europe is 2.0 W/kg. This device was tested for typical operation with the back of the handset kept 1.5cm from the body.
To maintain compliance with RF exposure requirements, use accessories that maintain a 1.5cm separation distance between the your body
and the back of the handset. The use of belt clips, holsters and similar accessories should not contain metallic components in its assembly.
The use of accessories that do not satisfy these requirements may not comply with RF exposure requirements, and should be avoided.
If you are using a pacemaker, hearing aids, cochlear implant or other device, please use the phone according to your doctor’s advice.
Your device is designed not to exceed the limits of emission of radio waves recommended by international guidelines.
The SAR value of the device may depend on factors such as proximity to the network tower or use of accessories.
| What’s in the Box Device OxygenOS Safety Information