If you are on the go and like to have a smoothie at any time, you may want to buy a single-serve Portable USB Blender. They are convenient, portable and easy to use. You can enjoy a nutritious drink whenever and wherever you want. You can mix a fruit or veggie smoothie at the office, in the car or the gym. You can also mix a smoothie while shopping. It is great for people who are on the go and for college students as well. Portable blenders must be fully charged before use. Typically, it takes two to three hours for them to fully charge. However, once charged, these devices can be used at least a dozen times before the need to recharge. They are reasonably priced and come in a variety of colors and are small and lightweight for easy transport.