Xtorm XR2S28 SolarBooster Foldable Solar Panel 28W - Thanks to the foldable SolarBooster from Xtrom with a power of 28 W, you can easily connect your smartphone, tablet or power bank to the solar panel via a USB-A or USB-C connector. Whether you're camping, spending a day by the water or at a festival, SolarBoosters will provide your mobile devices with new energy from the sun.