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 problems with the voltmeter! Module performance and features: With voltmeter display and the voltmeter can be self-calibrated. Using a 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 measured , and save the settings, even if the power is turned off and 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 soldering wires 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 2.0 A. For large currents, heat dissipation should be strengthened. The output power is 20 W, if it exceeds 15 W, 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 does 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) Delivered quantity: 1 piece Welcometomeet