Solar-powered window socket
These handy solar-powered sockets are still in their testing stage, but the idea is awesome. Thanks to the suction vacuum ring, you can easily stick it to a window, and the solar cells will charge the built-in battery. It can come in handy while you are somewhere camping or on a plane.
The battery isn’t very large (1000mAh), but it’s enough to charge cellphones and power small domestic appliances. However, the manufacturer promises the battery output will be increased very soon.