1.LED Numeric Display: The buck converter features an LED voltmeter display with a measurement error of ±0.1V. The input voltage range is 4.0V to 40V, and the output voltage range is 1.25V to 37V. Note that if the input voltage drops below 4V, the onboard voltmeter will cease operation and no display will be shown. To turn off the voltmeter, hold the switch for 1 to 4 seconds and release it. Once disabled, the voltmeter can be reactivated by briefly pressing the switch 2.LM2596 Adjustable Buck Converter: This secondgeneration voltage regulator operates at an internal oscillation frequency of 150KHz, ing low power consumption and high efficiency. It incorporates highquality solid capacitors to enhance circuit stability and durability while effectively filtering out highfrequency noise 3.Ease of Use: The LM2596 adjustable buck converter allows for easy adjustment of the output voltage using a mini screwdriver. Terminal blocks are provided for quick and solder connections 4.Features Safety: The input side of the LM2596 buck converter is protected by two diodes, ensuring operation even in the event of reverse polarity connection. Additionally, the module includes overheat and shortcircuit protection. For applications exceeding 15W, adequate heat dissipation measures should be implemented