Accucold by Summit Appliance's SPRF26M is a portable 12V/24V refrigerator/freezer designed for reliable refrigeration on the go. This lightweight portable cooler is operated by a high quality compressor and can be plugged into the 12V DC lighter socket inside any vehicle or a 24V battery source. An AC adapter is included with the unit for alternate use in a 110V electrical wall outlet. The resilient gray plastic exterior is equipped with a specially installed keyed lock to protect contents and sturdy side handles for easy carrying. We include a separate cart trolley to make transporting the SPRF26M even more comfortable. The SPRF26M can be set at refrigerator or freezer temperatures with the capability to reach -15 C. A digital thermostat with an external LED thermometer display allows easy temperature control without requiring users to open the lid. Inside, the SPRF26M can hold up to 26 liters in a durable hammered aluminum interior. With a conveniently versatile design and reliable storage conditions, the SPRF26M is ideal for applications that require easy transportation of cold items, such as collecting samples or administering vaccines at an off-site location. Larger sizes are also available. NOTE: Accucold refrigerators are purpose-built to the support meeting the current CDC (Centers for Disease Control) guidelines for the storage of vaccines. At this time, Accucold refrigerators have not been evaluated to the new NSF 456 standard. For additional temperature assurance, the CDC recommends a calibrated digital data logger (DDL), which can be added with the purchase of a DLSA11CAL accessory.