DollaTek LM2577 Boost Converter DC 3 34V to 4 35V 5V/12V Adjustable Step Up Volt Regulator with Red LED Voltmeter Voltage Monitor Power Supply Module
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Press the button next to voltmeter to display input voltage or output voltage; also press the button for 3 seconds to close or open Red LED display. Red LED lights on when testing input voltage and green LED lights on when testing output voltage. With power-off memory function, meaning the voltmeter shows voltage of your last measurement. Press the button for 3 seconds can turn OFF/ON the LED display With wiring terminal and keep wire connection point, hence is convenient to use.
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Amazon
Press the button next to voltmeter to display input voltage or output voltage; also press the button for 3 seconds to close or open Red LED display. Red LED lights on when testing input voltage and green LED lights on when testing output voltage. With power-off memory function, meaning the voltmeter shows voltage of your last measurement. Press the button for 3 seconds can turn OFF/ON the LED display With wiring terminal and keep wire connection point, hence is convenient to use.
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Press the button next to voltmeter to display input voltage or output voltage; also press the button for 3 seconds to close or open Red LED display. Red LED lights on when testing input voltage and green LED lights on when testing output voltage. With power-off memory function, meaning the voltmeter shows voltage of your last measurement. Press the button for 3 seconds can turn OFF/ON the LED display With wiring terminal and keep wire connection point, hence is convenient to use.
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