Product name: DC-DC adjustable voltage stabilized power supply module LM2596 voltage stabilization module with voltmeter display Product size: 66mm * 36mm * 14mm (length x width x height) Product weight: 23g (including packaging) Color: blue Packaging: electrostatic bag packagingScope of application:This module can be used in voltage reduction fields where the input voltage is higher than the output voltage, such as batteries, power transformers, adjustable regulated power supplies, 24V vehicle laptop power supplies, industrial equipment voltage reduction, 12V to 3.3V, 12V to 5V, 24V to 5V, 24V to 12V, 36V to 24V, etc.Features:With voltmeter display, the error of the voltmeter is 0.1V and the range is 4-40V. (Note: If the input voltage is less than 4 V, the built-in voltmeter will not work or display) The 5*5 large touch button switches the measuring input or output voltage, and an indicator light indicates which voltage is measured. By default, when the device is turned on for the first time, the digital tube displays the input voltage and the IN input indicator light is on; touch the button and the digital tube displays the output voltage and the output indicator OUT is on. And the latest settings will be retained even after the device is turned off and on. The voltmeter can be turned off by pressing and holding the switch for more than 1 second and less than 4 seconds and then releasing it. After the voltmeter is turned off, just short press the switch to turn on the voltmeter. Note: The data are all measured manually, please allow 1-3cm error, due to the difference in light and temperature. display, there will be a certain color difference, the actual object received shall prevail.