Whether in the park, at the beach, at a music festival or out trekking, Solartab lets you enjoy free and endless solar power. Simply open up the Solartab to start solar charging either the internal battery or or USB devices like your phone or tablet. Thanks to Solartab’s huge internal battery, you can even charge your devices after the sun sets. The typical list price on the charger has been reduced 47% to $69. See this deal on Amazon.