Health Enterprises HEALTH Portable LCD Display Insulin Cooler 2-8 Refrigerated Box Reefer USB Car Small Refrigerator Portable and fashionable Support DC12V DC, AC110V~240V, 3.7V battery, Battery ensure more than 12 hours working while no vehicle power or household power. Large LCD display, show the time and refrigeration temp clearly, interchangeable between 'C and 'F Antifreeze function Environment friendly: Using thermoelectric refrigeration