Unlike conventional household refrigerators, cosmetic refrigerators operate on the principle of thermoelectric cooling (Peltier), eliminating the need for compressors and refrigerants. They are environmentally friendly, free of ozone-depleting substances, and quiet enough. All COOSEON Mni Beauty Fridges have two power supply lines, one for 110V AC Power Cord and one for 12V DC Power Cord. Our LED Lighted Beauty Mini Fridge uses a 110V AC Power Cord in your home and a 12V DC Power Cord through a cigarette lighter in your car, RV, or boat.