LG GC-B559BLQZ refrigerator-freezer offers various features for preserving and organizing your food. With Express Freeze, you can quickly freeze food to retain its freshness and flavor. The Eco Friendly mode helps save energy by adjusting the compressor speed. The Self Test feature monitors the appliance's performance and alerts you to any issues. The Door Alarm notifies you if the door is left open, preventing food spoilage. Lock function adds an extra layer of security to your appliance. On/Off function allows you to conveniently turn off the appliance when not in use.