DROK Micro Portable DC Boost Converter Voltage Transformer LM2577 3-34V to 4-60V Power Supply Module Adjustable Output Volt Regulator 5/12/24V Power Board Use the converter by welding and can directly solder it to PCB by adding pin Work as DIY mobile power supply, boost voltage converter, step-up volt charger, etc Operating temperature of industrial grade -40c to +85c (please reduce power or add fan when ambient temperature exceeds 40 c) Simple installation requires merely screw (3 mm in diameter) for 2 fixing holes