Rechargeable USB Milk FrotherThe portable milk frother is powered by built-in rechargeable battery, no battery replacement, eco-friendly and money-saving. It has a light indicator. Green light indicates full battery and red indicates low battery. After fully charged, it can be used for a few days. 3-speed adjustable coffee frother3 gears allow you to choose different speeds to achieve ideal frother effect. Low speed for blending powdered protein shakes. Medium speed for making matcha tea. High speed to create creamy milk froth that can be used in coffee, latte, cappuccino and beverages. USB Rechargeable Electric whisk eliminates endless hassle caused by changing of batteries. The milk frother can be electrically charged anytime and anywhere via the USB interface. This not only saves battery acquisition costs, but also makes operation more convenient. When fully charged, it can work for a long time. High Quality Cordless Milk FrotherThe detachable whisk head is made of food grade 304