The Solgaard Solarbank Boombox consists of a Bluetooth speaker, power bank and solar panel, so it charges automatically when exposed to sunlight. Up to four devices can be powered in this way – both wirelessly and via USB or USB-C outputs. The exterior materials are made of upcycled ocean plastics, and the device is also water, sand and drop resistant. Two 7-watt drivers ensure a convincing audio experience.