1. The input voltage range of 4-40V, 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 regulate the voltage connected load and prevent damage to the load. 4. more than 5A current, please enhance heat dissipation.