Electrolux ER3409B is a refrigerator-freezer designed for storing food and drinks at different temperatures. It features a spacious refrigerator compartment with adjustable shelves and a door with bottle holders for storing different sizes of bottles. The freezer compartment includes a freezing button for quick freezing and a thermometer to monitor the temperature. The device is equipped with a steplessly adjustable thermostat for both the refrigerator and freezer compartments, allowing users to set the desired temperature for optimal food preservation.