There are many battery chargers and solar energy harvesters out there already, but the Solar energy click has the unique feature - it encompasses both of these devices in a single package. The click uses Texas Instruments BQ25570 - a nano-power high-efficiency boost charger and buck converter device, designed to work with very low power energy harvesting elements, such as the photovoltaic and thermoelectric generators. The Solar energy click recharges the connected LiPo battery or the onboard 220mF supercapacitor, using the photovoltaic element. This is done by utilizing the BQ25570's charging and power harvesting capabilities and clever nano-power management features.