Does the PEMF have effect on entire mat or just on the coil spots?

The PEMF intensity is maximum on the spot where the coil is located and falls as per inverse square law.

The coils are powerful enough to sill have effects in 100-200 mG range 6-8 inches around and above the PEMF coil so that the mat influences all body.

The cellular regeneration and bio-magnetic processes do not need too high intensities to cause resonance effects.

However, to manage pain or discomfort, you may need to focus the coil directly on that part of the body you need.

You can find the exact location of the coils with a plastic vial with a small piece of magnetic metal inside. It will move most of all on that spot where the coil is.