About this item LED Numeric Display: This buck converter features an LED voltmeter display with 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 if the input voltage is below 4V, the onboard voltmeter will not operate and will not display anything. The voltmeter can be turned off by holding the switch for over 1 second and less than 4 seconds, then releasing it. To turn it back on, simply press the switch briefly. Adjustable Buck Converter: The internal oscillation frequency is 150KHz. It is a voltage regulator designed for low power consumption and high efficiency, featuring high-quality solid capacitors to enhance circuit stability and durability, while effectively filtering out high-frequency noise. Ease of Use: This adjustable buck converter allows for easy output voltage adjustment using a mini screwdriver. It includes terminal blocks for quick connections, eliminating the need for soldering if