Works on batteries: the electric guard works on a built-in lithium battery of 1200 mAh. And it is rechargeable via USB and can be used for about 90 minutes after being fully charged. Stainless steel: the mixing head and shaft are made of stainless steel, which makes the portable electric foam machine rust-proof, dirt-repellent and not easy to break. during daily use. 3 adjustable speeds: the portable electric milk frother has 3 different mixing speeds to meet your different needs. Can be used for cooking at home or making coffee. PRACTICAL DRINK MIXER: The cordless stick blender is perfect for making coffee, ketchup, latte, cappuccino and hot chocolate. It can also be used for frothing cream and eggs. Easy to disassemble and install: this electric milk frother has fine workmanship, stable performance, simple operation and long service life.