10 Pieces Mini DC-DC Boost Converter Module 3.7V to 12V Lithium Battery Voltage Regulator Boost Power Supply Module

★ The output voltage of the step-up converter can be set to 5V/8V/9V/12V, with 12V being the default.
★ The input voltage range is between 2.5V and 5V (the input voltage must be lower than the set output voltage).
★ Voltage adjustment instructions are located on the front of the circuit board, labeled A and B. The output voltage can be changed using a soldering iron to switch the on/off pad.
★ Made with high-quality, military-grade PCB material, it features safe wiring interfaces, a smooth surface, high oxidation resistance, and no solder defects. It has a built-in LED indicator for easy viewing of the buck boost converter's operating status.
★ Package contents: 10 x mini DC-DC boost converter modules