About this item LED Numeric Display: This buck converter is equipped with an LED voltmeter display, featuring a measurement error of ±0.1V. The input voltage range is from 4.0V to 40V, and the output voltage range is from 1.25V to 37V. Note that the onboard voltmeter will not operate and display if the input voltage is below 4V. The voltmeter can be switched off by holding the switch for over 1 second and less than 4 seconds, then releasing it. To turn the voltmeter back on, simply press the switch briefly. Adjustable Buck Converter: The internal oscillation frequency is 150KHz. This second-generation voltage regulator offers low power consumption and high efficiency, utilizing high-quality solid capacitors to enhance circuit stability and durability while effectively filtering out high-frequency noise. Ease of Use: The adjustable buck converter allows for simple output voltage adjustments using a mini screwdriver. It includes terminal blocks for quick connections, so soldering is not