The knock feature is my favorite part of this LG refrigerator is so fun and fulfilling. We no longer have to waste energy surfing the fridge with standing it open. It has so many sections and compartments it is a organized persons dream, or perfect for a large family. The storage space is smart, no inch is wasted. It is the most efficient refrigerator I have ever had. Smart features like Wi-Fi, auto water shut off, and a door alarm if its left open and energy savings. Plus, I don't have to worry about odors because of the built in air filter. They really thought of everything. I highly recommend this LG refrigerator.