Beer Foam Maker Battery Operated Beer Foamer Outdoor Accessories The foam design enriches the fresh and refreshing taste of beer, and tastes the bubbles with a touch of milk. Injection of rich and delicate bubbles, everyone can simply make the ratio of beer 7 3 beer foam . The foam makes the carbonated in the pot not easy to volatilize and is not easy to oxidize, so it can keep beer's own flavor for a long time.