Features: _x000D_ This is a 5A high power high efficiency DC-DC buck module with low ripple and converts 4.0V~38V to 1.25V~36V. _x000D_ The voltmeter on board can be self calibrated; using more advanced voltage microprocessor, voltmeter error is 0.05V, measuring range of 0~40V. _x000D_ Input and output have screw terminals for convenient connection even with no soldering iron, and keep solder pad for soldering connection. _x000D_ It supports overheating protection and short circuit protection function. _x000D_ Comes with heat sink for better heat dissipation, and several standoffs and nuts. _x000D_ _x000D_ _x000D_ Specifications: _x000D_ Input Voltage: 4.0V~38V (input voltage should be at least 1.5V higher than the output voltage)_x000D_ Output Voltage: 1.25V~36V (continuously adjustable)_x000D_ Output Current: Max. 5A(4.5A or less is suggested)_x000D_ Max. Output Power: 75W_x000D_ Max. Efficiency: 96% (Efficiency is related to input/output voltage, current and voltage difference)_x000D_ Load Regulation S(I): 0.8% Voltage Regulation S(u): 0.8%_x000D_ Size: 60*36*18mm/2.36*1.41*0.7" _x000D_ _x000D_ _x000D_ Voltmeter Self-calibration Instruction:_x000D_ 1. When the voltmeter on board displays output voltage, press and hold the right button for 2 seconds to enter output voltage regulation mode, and the voltmeter display and output voltage indicator light synchronously flash.Similarly, when the voltmeter on board displays input voltage, press and hold the right button for 2 seconds to enter input voltage regulation mode, and the voltmeter display and input voltage indicator light synchronously flash._x000D_ 2. Press the right button to increase voltage value, and left button to reduce voltage value.Due to a unit of voltage is less than 0.1 V, so you need to press button for 1 time~5 times to see the voltage value changes 0.1V._x000D_ 3. After voltage adjustment, press and hold the right button for 2 seconds then release to exit voltage calibration mode. All the parameters set up will be automatically saved if power failure. _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ Note: To ensure that the voltage meter accuracy, please make sure that the input voltage is above 4.5V _x000D_ _x000D_ _x000D_ Package Includes: _x000D_ 1 x Step Down Module _x000D_ 1 x Heatsink _x000D_ 4 x Standoffs and Nuts