Cole & heat are transferred through coated aluminium liner; Convenient-plug into any 12 volt cigarette lighter in car, boat or plug into safe AC adaptor out. Power: Cold mode: 40W±10% Hot mode:36W±10% DC: 12V; AC: 100V 240V 20°C below ambient temperature 60°C by set-point thermostat Full polyurethane-foam lining w/o CFC.