Bring power with you on any adventure with the Estream Portable Water Power Generator. Relying on Mother Nature, this compact yet easy to use system converts any type of moving water into storable energy. Equipped with a USB port, the Estream Portable Power Generator can top up anything from your smartphone to your tablet to your GPS device. Fitting into your backpack or even your pocket, the Estream Portable Power Generator folds into a smaller shape until you’re ready to use it. When you need some power, simply place the device in moving water. The turbine will be moved by the water which then brings the energy to the generator. From there, the built-in battery gathers and stores the energy until you need it. With enough energy storage for up to three smartphone batteries, the Estream Portable Power Generator is a must-have for any trip.