The Sandberg Outdoor Solar Powerbank is a portable battery that can be charged via a USB port or the integrated solar cells. With the Sandberg Outdoor Solar Powerbank in your luggage, you will never again have an empty battery on your phone or mobile device if there is no socket for charging in the vicinity. A commercially available smartphone can be charged up to 6 times. The robust and waterproof packaging ensures that it is ready for use everywhere. You can charge up to two devices simultaneously.