Adjustable Buck Module High Power 400W Anti Reflow Multiple Protection DC to DC Buck Module for Fan Item Type: Adjustable Buck Module Material: Aluminum alloy, PCB Input Voltage Range: DC12-75V Output Voltage Range: DC2.5-50V adjustable (for applications where the input voltage is greater than the output voltage and cannot be boosted) counterclockwise to increase the voltage clockwise to decrease the voltage Output Current: 15A (25A MAXIMUM) Operating Frequency: 150KHz Isolation Voltage: Non isolated Isolation Voltage: Non isolated Output Power: 400W MAXIMUM Built in Fan Temperature Control: Yes (starts at about 45°C at 12V) Conversion Efficiency: 95% typical, efficiency and differential voltage size load power size related input anti reverse connection: no (if needed please add a series of 2 diodes at the input) Minimum Differential Voltage: 3V (the higher the input voltage, the greater the minimum differential voltage requirement) Sizes: Approx. 85 x 58 x 38mm / 3.4 x 2.3 x 1.5in