Parameters: Input voltage: 4-40V Output voltage: 2A continuous output Output current: maximum 15W Output power: 150KHz Ripple frequency: 100mv Grain peak: ±5% Dimensions: 57*36*14mm Weight: 21g Instructions for use: 1. With power indicator light; 2. With voltmeter display, using advanced microprocessor, voltmeter error +0.05V, range 0-40V. To ensure the accuracy of the voltmeter, please make sure that the input voltage is above 4V; 3. Press the button on the right to switch the input or output voltage; 4. The voltmeter can be turned off. When it is not needed, just touch the button on the left; 5. With terminal blocks, it can be used easily without a soldering iron, and the welding wire connection point is retained; 6. The output current can be as high as 3A, and the normal stable working current is 2A; 7. It adopts an internal oscillation frequency of 150KHz, which belongs to the second generation of switching voltage regulator, with low power consumption and high efficiency; 8. It has overheat protection and short circuit protection functions. Note: 1. When the power is greater than 15W, a heat sink should be added to enhance heat dissipation; 2. When the output voltage cannot be adjusted, please turn the potentiometer counterclockwise for more than 10 turns before normal use. Package Contents: 2 * DC-DC Step Down Buck Power Convert Module