• DC-DC 5-40V to 3.3V 5V 12V ADJ Adjustable Step Down Voltage Regulator, LM2596 4-Way Multiple Output Switching Power Supply Module Board, 5A Buck Volt Converter Transformer Stabilizer KWD 6.500
• 2pcs DC 5V USB Fan stepless Speed Controller Regulator with Switch Speed Module Input DC 4-12V to 2.5-8V 5W KWD 3