Your smartphone will always be charged with the WakaWaka Power Plus 3000 mAh, even when you're not near a socket. The power bank is equipped with a solar panel that stores solar power. This way, you'll always have a fully-charged power bank to charge your smartphone, even when you're at a music festival. It takes about 8 hours to fully charge the power bank. Thanks to the foldable stand, you can put the power bank in the sun to charge while you're having fun at a music festival. Connect the external battery to your phone with a USB cable and go out well-prepared.
Note: this power bank doesn't come with a USB cable.