The refrigerator has a zero-degree freshness room (also called a biological freshness room), which is a three-door computer-controlled refrigerator. This refrigerator has a three-refrigeration cycle system. The computer control screen on the door has a biological freshness setting button. . The temperature of the 0-degree fresh-keeping compartment of the Siemens three-door refrigerator can be selected between 0---4 degrees: first press the temperature setting button at the top of the computer screen, and the LCD will light up the top level (refrigerated), and then press the LCD Turn on the second grid (preservation), press again and it will turn to (freezing) and the cycle starts again; after turning on the preservation, start using the arrow keys to select 0---4 degrees.