The Estream is a lightweight turbine system, a sustainable, eco-friendly generator that converts any type of moving water into power for your USB devices.
Water from active rivers and streams, or quiet water that kicks up behind your kayak or hot tub tug boat, spins the Estream turbine, which can then generate 2.5W to 5W of electricity. It takes around 4-1/2 hours to charge the system's 6,500mAh battery with running water. A full battery can pass on its juice to up to 3 smartphones, GoPros, or tablet PCs. Estream makes say the device will even do it twice as fast as a regular outlet.