HW-140 DC-DC Buck Boost Converter Step Up/Down, LCD display, 3A 5.5V-30V for 0.5V-30V compatible with Arduino
Buck-boost converter - imperix
Dc Buck Converter Step Module Power 12v | Stabilizer Voltage Converter 12v - Boost - Aliexpress
Amazon.com: D DPH5005 Communication Version Buck Boost Converter Constant Voltage Current Programmable Digital Control Power Supply (DPH5005-USB-BT) : Electronics