1. Comfortable price, intelligent and humanized design, and cost-effective 2. Built-in voltmeter, the voltmeter can be self-calibrated, and there will be no problem with the voltmeter Module performance and functionality: With voltmeter display and the voltmeter can be self-calibrating. Using more advanced voltage microprocessor, the error of the voltmeter is 0.05V, and the range is 0-40V. (To ensure the accuracy of the voltmeter, please ensure that the input voltage is higher at 4.5V) Press the button to change the measurement input or output voltage, and there is an indicator light to show which voltage is being measured , and save the settings, even if the power is turned off and then on again. The voltmeter can be turned off, which can be easily achieved by pressing the left button when it is not necessary. With the terminal blocks, it is easy to use without a soldering iron and the connection points of the wires to be soldered are preserved. Input voltage 4.0 ~ 40V. (Input voltage should be more than 1.5V higher than output voltage) Adjustable output voltage range 1.25V~37V adjustable continuously. (The input voltage should be 1.5V higher than the output voltage) The output current is 3A and it is recommended to use within 2.0A. For large currents, the heat dissipation should be strengthened. The output power is 20W, if it exceeds 15W, please strengthen heat dissipation. High conversion efficiency, with an average of 88% (efficiency is related to input, output voltage, current and voltage difference) With reverse connection protection, reverse connection will not burn With protection overheating and short circuit protection Size 6.1*3.4*12cm (L*W*H) (Manual measurement, the size is slightly deviated, does not affect the use) Delivery quantity: 1 piece