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For enthusiasts and hobbyists to integrate renewablely energy solution into their projects or home setting Efficient Photovoltaic Solar Battery Charging Automatic Light Control Board PCB Perfect for outdoor lighting garden lights, and other solar powered applications where automatic light activation is desired 3.7V 4.2V 8.4V 12V Efficiently manage and optimizes your solar charging needs This control board supporting up to 600mA output current while ensuring protecting against overcharge and discharge for batteries