1. The input voltage range of 4-38V, the output voltage range of 1.25-36V. 2. The digital display is the output voltage. 3. Adjust the potentiometer knob: clockwise to adjust the output voltage is increased; counter-clockwise, the output voltage is reduced; after re-regulate the voltage connected load and prevent damage to the load. 4. more than 5A current, please enhance heat dissipation. 5. The low voltage display 0.01V, high-voltage display accuracy 0.1V. Product Name: DC voltage regulator module. Voltage mode: PWM modulation. Input voltage: DC4-38V. Output voltage: DC1.25 ~ 36V. Maximum current: 8A (long work proposals 5A). Maximum power: 250W. Conversion efficiency: 95%. Switching Frequency: 180KHz. Protection: short circuit protection, input reverse polarity protection, over-temperature protection (over temperature cut off the output). Colour:blue+black Material:PCB+electronic components Size:64 x 47 x 26mm Package Contents: 5 drop Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.