Introducing the Solgaard Solarbank 3-in-1 Speaker System. This all-in-one really has it all. At its heart, the Solarbank is a powerful speaker. Connecting via Bluetooth, the speaker features a bass radiator to pump out your audio as it was intended to sound. However, this isn’t just a speaker. On the back are integrated 4G solar panels. This means that they function across the light spectrum including sunlight as well as indirect light. Likewise, it also works with any USB device. With two ports, you can also simultaneously charge two devices for optimum efficiency. The Solarbank can gather enough light to provide the device with 96 hours of non-stop music. Or, you can use the power to fully recharge your iPhone six times over.