Description: 【Versatile Application】: This DC to DC Buck Converter is great for applications where the input voltage is higher than the output voltage, such as battery systems, power supply, DIY adjustable power supplies, automotive power supplies for laptops, industrial equipment voltage reduction, and various voltage conversions like 12V to 3.3V or 24V to 12V 【Voltage Display】: Voltage Regulator is equipped with a digital voltmeter display with an accuracy of ±0.1V and a range of 4-40V. Note that the voltmeter will not function if the input voltage is below 4V 【User Friendly Operation】: Features large tactile buttons for easy switching between input and output voltage measurements with indicator lights showing which side is being measured. The module remembers your last setting even after being powered off 【Adjustable Calibration Function】: Voltage Regulator Module, includes a calibration feature for correcting measurement errors in both input and output voltages, allowing adjustments within a range of -0.5 to +0.5 volts 【Sturdy Design & Protection】: Built with terminal blocks for easy connection without soldering and includes polarity protection on the input side to prevent damage from incorrect connections. It also features overheat and short circuit protection (ensure additional heat dissipation if exceeding 15W) Specification: Material: Electronic Components Input voltage: 2.5V~40V Output voltage: 1.25V~37V (adjustable) Output current: 3A (maximum) Conversion efficiency: 92% (highest) Switching frequency: 150KHz Operating temperature: -45 Celsius~ +85 Celsius Size Chart: 6.6cmx3.6cmx1.4cm/2.60inchx1.42inchx0.55inch Package Includes: 4 Voltage Regulator Module