It is a specialized film which converts electrical energy to thermal energy. It is used to control the temperature of the mirror surface so that fog does not deposit on it.

Cleario

Technical Specifications:

ELECTRICALOperating Voltage
Operating Frequency
Power Consumption
50 VAC
50-60Hz
200W/m2
FILM THICKNESS0.4mm
DESIGNS AVAILABLERectangular
Round
Oval