What shows Controller Displayed Temperature?

The controller's display shows for a moment a set temperature, then switches to the current one. 

These figures do not show the mat surface temperature, which is much lower because crystals radiate and dissipate warmth if a blanket or your body does not catch it. 

Also, how warm the mat to touch depends on air velocity, ambient temperature, and many other circumstances. 

The controller displays the condition of the heating elements inside the mat, which is closer to the surface temperature when you lie on the mat, and press the crystals layer closer to the heating elements.