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Features: - There are output voltage adjustment "-" button for decreasing output voltage and output voltage adjustment " +" for increasing output voltage. - There are two LED indicators on this converter board, including the red LED and the green LED. The red LED will light on when you measure input voltage and green LED will light on when you measure output voltage. - It is low power consumption, and has terminal and retain the wire bonding wiring point. And If you remove the P3 jumper cap, the voltmeter will shutdown. Specification: - Module Model: LM2596 Buck Converter + Voltmeter - Cutting Size: 66.04mm x 35.05mm - Input Voltage: DC 4.2-40V - Output Voltage: 1.25V~37V (continuously adjustable, the input voltage must be 1V higher than the output voltage) - Output Current: 2A (normal and stable), 3A Max. - Ripple Frequency: About 150Khz - Ripple Peak: About 100mV - Display Color: Red - Voltage Meter Error: ± 0.1V Wiring connection: IN+: connect IN+ to your Input Positive IN-: connect IN- to your Input Negative Out+: connect OUT+ to your Output Positive Out-: connect OUT- to your Output Negative Applications: - Experiment teaching - Temporarily set up power supply in the outdoor - Car(audio, electric fan)power supply Package includes: 1 x DC-DC Volt Buck Converter