The Massimo ENX62 E-Kooler has a compressor built into each unit for optimum cooling performance. Equipped with a rechargeable, interchangeable lithium-ion battery, the ENX62 allows you to run your E-Kooler on battery alone for up to 3 hours, or you can plug your E-Kooler into any wall outlet or 12V DC outlet in your car. With a built-in USB port, you can simultaneously charge your devices. The LED digital display is easy to use and has a range of cooling from 68 to 0 degree. Whether you are on the road, camping, boating, or at a football game, the E-Kooler is the perfect accessory to keep your food and drinks crisp and cold.