The vehicle demister is necessary, once fog condensed on an exterior side view mirror and prevents visibility when driving.

Tienly rear view mirror demister /defogger is also sandwiched in between two pieces of PET, and the electric circuit is made of conductive thick liquid, enamel-insulated wire or resistance wire.

Tienly mirror demister /defogger are adhesive pads, when covered onto the back of the mirror, it will result in a warming of mirror surface, the mist got rid of.