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 to monitor voltage settings in real time or conserve power 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. Efficient Power Regulation: Featuring an internal oscillation frequency of 150 kHz, the converter ensures low power consumption while maintaining high efficiency. Solid capacitors enhance circuit stability and durability while effectively filtering high-frequency noise. User-Friendly Interface: The onboard voltmeter does not operate if the input voltage falls below 4V. A simple press-and-hold mechanism allows control over the voltmeter display. Color: As Shown Material: PCB + Components Package Contents: 4 x DC-DC Buck Converter Note: Light reflection and display differences may cause slight color variation between the image and the actual product. Measurement tolerance is ±1–3 cm.