About this item LED Numeric Display: The buck converter features an LED voltmeter with ±0.1V error. Input range is 4.0V-40V, output range is 1.25V-37V. Below 4V input, the display turns off. Hold the switch for 1-4 seconds to disable the voltmeter; press briefly to reactivate. Adjustable Buck Converter: This second-generation voltage regulator operates at 150KHz, ensuring low power usage and high efficiency. High-quality capacitors provide stability, durability, and noise filtering. Ease of Use: Adjust the output voltage easily with a mini screwdriver. Quick-connect terminal blocks eliminate the need for soldering. Features & Safety: Two diodes protect against reverse polarity. Overheat and short-circuit protection are included. For outputs exceeding 15W, it is recommended to add heat dissipation. Applications: Versatile for automotive, DIY, and industrial use, suitable for both professionals and beginners. Dimensions: 5.79 x 3.43 x 1.65 inches.