The OutIn Nano Portable Electric Espresso Machine is a convenient travel coffee maker designed for camping and on-the-go use. This compact unit requires 3 lithium metal batteries (included) to power its 20 bar pressure espresso maker, capable of brewing a single cup of espresso in just 200 seconds. With a water tank capacity of 1.7 ounces and a sleek metallic finish, this portable coffee maker is easy to use and clean. The automated control panel, rechargeable battery, and USB-C charging feature make it a versatile and efficient option for coffee lovers on the move.