The PDair Energy Source (ES) Defrosting Tray is using special operation mechanism on Phase Change Inhibited (PCI) Heat Transfer Technology to thaw the food quickly ( up to 3x to 5x faster). No electricity, No hot water, No batteries. Simply set a flat piece of food and our ES Defrosting Tray goes to work. There is no recovering time and no waiting for the second, third and the fourth defrosting task. Energy reservoir will automatically replenish via thermal equilibrium with the ambient air through our patterned micro-fin and honeycomb structure.