Features: Efficient Photovoltaic Solar Lithium Battery Charging Automatic Light Control Board PCB. 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 lithium batteries. For enthusiasts and DIY hobbyists to integrate renewablely energy solution into their projects or home setting. Perfect for outdoor lighting system, garden lights, and other solar powered applications where automatic light activation is desired. Specifications: Item：Automatic Solar Panel Battery Charging Board Size:about 3.1x1.8cm/1.22x0.71in Component：ABS Support 3.7V 4.2V 8.4V 12V Support to 600mA output Package Includes: 1PC Automatic Solar Panel Battery Charging Board note: Due to the problemsof lighting effect, there will be tolerances in product, please understand. Please allow 0-1cm error due to manual measurement