Barska Portable Solar Charger Case with Built-in Speaker is a solar charger, output speakers and sturdy carrying case all-in-one. Power is provided by using either the USB charging port or solar energy, which means you can charge the internal battery by USB, then take it outdoors and place it under the sun for an all-day power supply. The built-in speakers of the Barska Solar Charger Case also provide amplified sound to any device with corresponding jack. The strong protective case also features an inner storage that can safely store most personal mobile devices while on the go or while charging. Included adaptors can charge most electronic mobile devices such as cell phones, MP3 player, GPS, Bluetooth devices and more. Compact in size, ideal for outdoor activities such as camping or boating, traveling and more. TheBarska Solar Charger w/ Speaker is the best solution for an emergency power supply when your devices are low on electronic power.