People ask, what makes the Kickr™ IV+ portable solar charger case so flexible, and durable? It's the CIGS solar technology they're made with. While most solar panels, like monocrystalline are placed on a glass substrate which makes the units heavy, rigid, and very breakable, Ascent's CIGS solar has the ability to place solar on a plastic backing. This allows the solar panels to be extremely flexible, super lightweight, and quite rugged. And this solar technology is patented so only EnerPlex sells these specific panels manufactured by our parrent company Ascent Solar. The Kickr™ IV+ portable solar charger case can charge a variety of USB-enabled devices, up to tablets. Obvoiusly, the more solar cells that are exposed to the sun, the stronger the charge will be. Therefore, our Kickr™ II+ two cell 3.0 watt flexible solar charging case would be our slowest charging Kickr panel (5V @ 0.6 Amps), while the Kickr™ IV+ with its four cells (5V @ 1.2 Amps) can charge small electronic devices like smartphones & tablets at about the same rate as being plugged into the wall outlet. Our CIGS solar is also made here, in the USA.