The "Nitrogen Coffee Cup" we developed is a portable, mini device for hand-cold-brewing nitrogen coffee. It combines many advantages such as high-pressure extraction, dense visibility, pressure readability, safety and pressure controllable, etc., in a zero-sugar and zero-fat way. Achieve instant nitrification of cold brew coffee. Main performance: 1. The nitrogen coffee cup is specially designed for one person. It can brew 300ml of nitrogen coffee each time, which is enough for one person to drink one cup of conventional American coffee a day. There is no waste of coffee and it can be made and enjoyed immediately. 2. No milk or sugar is added. The nitrogen cartridge punched from the bottom and reaches the liquid tank, allowing coffee and nitrogen to be effectively mixed with no gas waste. The gas-liquid fusion process in the high-pressure cup can better extract the oil and aroma of coffee, reduce the acidity and bitterness of coffee, and make the entrance denser. 3. A pressure gauge is installed on the upper cover of the liquid tank, which can effectively monitor the pressure in the cup. The pressure "gathering" during the gas-liquid mixing process can be clearly seen at a glance. When the pressure reaches a certain value, excess gas will be automatically released through the safety valve on the upper cover, which is safe and reliable. 4.The bottom cover is designed to store three 2-gram N2 gas bombs. There is a built-in magnet in the center of the bottom cover. The used cartridge can be sucked out by the magnet, making it easy to remove. The liner of the liquid tank is sprayed with ceramic, and is specially equipped with a drink cup. It is processed with transparent Tritan material, which combines the visual and food-grade features to present the cascading frothy texture.