The Solarbank is a 2-in-1 unit that is a powerbank to charge devices and it is also a solar panel.
The solar panels are very efficient, taking around 4 hours of sunlight to generate enough power for a phone charge. Solar puts power into the battery.
The battery is 10,000 mAh, meaning that when full it stores about 4-5 charges for an iPhone.
The device can also be plugged into the wall to be charged as well. This can be done by Micro USB or USB-C.
*This version does not have a bluetooth speaker.