WYPH B3603 LM2596S 4 Digital DC-DC Constant Voltage Current Step-Down Module 6V-40V to 0-36V 0-3A Product Name: DC-DC Constant Voltage Current Step-Down Module; Model: B3603 Input Voltage: DC 6V-40V; Output Power: 0-36V, 3A Module Size: 6.6 x 5 x 2cm/2.6 Main Material: FR4, PCB, Plastic Package: 1pcs DC-DC Constant Voltage Current Step-Down Module