Features: brand new and high quality With voltmeter display, the error of the voltmeter is ±0.1V, and the range is 4～40V. (Note: if the input voltage is lower than 4V, the onboard voltmeter will not work and will not display). Input and output voltage measurement error calibration function to meet your higher accuracy requirements. With terminal blocks, it is easy to use without a soldering iron, and the wire connection points are reserved. Adopting an internal oscillation frequency of 150KHz, it belongs to the second-generation switching voltage regulator with low power consumption and high efficiency. It has overheat for protection and short circuit for protection (please strengthen heat dissipation if it exceeds 15W), and the input end is protected by two tubes, and the reverse connection will not burn the module. Specifications: Material: ABS Size: Approx. 65x39.3mm/2.55x1.54inch Input Voltage: 2.5v~40v Output Voltage: 1.25v~37v (Adjustable) Output Current: 3A (Up To) Conversion Efficiency: 92% (Up To) Output Ripple: <30mv Switching Frequency: 150khz Working Temperature: -45℃~ +85℃ Package Includes: 1x Voltage Regulator note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.