Voltage Measurement: Equipped with an LED voltmeter, this DC-DC Buck Converter offers precise voltage readings with a minimal error margin of ±0.1V. The voltmeter can be easily toggled on and off, allowing real-time voltage monitoring or power conservation when needed. Wide Input and Output Range: This adjustable buck converter supports an input voltage range of 4V to 40V and an output voltage range of 1.25V to 37V, suitable for various applications including DIY electronics and industrial use. Efficient Power Regulation: Featuring an internal oscillation frequency of 150kHz, the converter ensures low power consumption while maintaining high efficiency. Solid capacitors enhance circuit stability and durability, and effectively filter high-frequency noise. User-Friendly Interface: The onboard voltmeter does not operate if the input voltage falls below 4V, ensuring reliable readings. A simple press-and-hold mechanism allows easy control of the voltmeter display. Color: As Shown Material: PCB + Components Package Contents: 4 Pack DC-DC Buck Converter Note: Light reflection and different displays may cause slight color variation between the image and the actual item. Measurement tolerance is ±1–3cm.