Description <br> With a voltage meter and voltmeter displays self-calibration. Uses a more advanced microprocessor voltage voltmeter error ± 0.05V, Range 0 - 40V. (To ensure accuracy voltmeter, make sure the input voltage of 4.5V and above). <br> Touch of a button to switch the input or output voltage measurements and has a light show which is being measured voltages, and save the settings, even the power off and then on. <br> The voltmeter can be turned off when not needed, easily with the touch of a button on the left. <br> With terminal blocks, it can be used easily without a soldering iron, and the soldering wire connection points are retained. <br> Input Voltage 4.5- 40V. (Input voltage must be higher than the output voltage of 1.5v or more) <br> <br> Adjustable output voltage range of 1.25V - 37V continuously adjustable. (Input voltage must be higher than the output voltage of 1.5V) <br> Output current 3A, recommendations within 2.0A use, high current needed to enhance heat dissipation. <br> Output power 20W, 15W, please enhance heat dissipation over. <br> High conversion efficiency, on average 88% (efficiency and the input and output voltage, current, pressure related). <br> With reverse polarity protection, reverse polarity does not burn. <br> With overheating protection and short circuit protection function. <br> Application: <br> This module can be applied to fields in the input voltage is higher than the step-down output voltage, such as batteries, power formers, DIY adjustable power supply, 24V Car T of the power equipment industry buck, 12V switch 3.3V, 12V switch 5V, 24V switch 5V, 24V switch 12V, 36V 24V turn and so on. <br> Colour:Blue <br> Material:PCB+electronic components <br> Size:66mmx36mm <br> <br> Package Contents: <br> 3 * DC DC Step Down Converter <br> <br> Only the above package content, other products are not included. <br> Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real <br>