1. That's its "patented floating air pump system". It has a small nitrogen chamber. When the jar is opened, the nitrogen chamber in the listening room is also opened, and nitrogen is slowly released, making the beer as rich as fresh draft beer in the bar. That's about it.
2. The floating air pump inside can automatically inject mixed gas of nitrogen and carbon into the wine within a few seconds of opening the can, and draft beer can be made immediately ~ ~ ~