Usage Tips:Features: brand and high quality The input voltage range of 4-40V, the output voltage range of 1.25-36V. The digital display is the output voltage. 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. The low voltage display precision- 0.01V, high-voltage display accuracy 0.1V With short circuit protection, input reverse polarity protection, over-temperature protection (over temperature cut off the output) Specifications: Product Name: DC voltage regulator module. Product Type: XH-M404 Voltage mode: PWM modulation. Input voltage: DC4-40V. Output voltage: DC1.25-36V. Maximum-current: 8A (long work proposals 5A). Maximum-power: 200W. Conversion efficiency: 94%. Switching Frequency: 180KHz. Note: Please keep the input and output differential pressure above 2V Long distance running current is recommended. If the power is too high, please add fans or other ways to enhance- heat dissipation This module is a step-down module, not a step up module Please allow 1-3mm measuring deviation due to manual measurement. Package includes: 1PC x XH-M404 DC Voltage Regulator Module y