Holy Feather Adjustable Voltage Regulator Module - SJ4 Buck Boost Converter with Solar Charging, 3V-30V DC to DC Step Up/Down Power Supply for Electronic Projects

["【Precision Voltage Control】 This adjustable buck boost converter allows both step-up and step-down voltage conversion from 3V to 30V, providing precise power management for various electronic applications and DIY projects.","【Integrated Solar Charging】 Features a built-in step-down solar charging function that efficiently harnesses solar energy to charge your devices, making it ideal for outdoor and renewable energy applications.","【Advanced SJ4 Protection】 Equipped with recoverable constant voltage and constant current SJ4 technology that ensures stable power output while protecting against overloads, short circuits, and voltage fluctuations.","【Compact & Versatile Design】 The miniature footprint (1.5×1 inch) enables easy integration into space-constrained applications including power banks, LED drivers, and portable electronic devices.","【Wide Application Range】 Suitable for multiple uses including laboratory power supplies, battery charging systems, automotive electronics, and solar-powered projects with its flexible DC-DC conversion capabilities."]