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undefinedParameters: Input voltage/ voltmeter range: DC 4.5~40V (please input voltage 6.5 ~ 40V , then can get a 5.0V stabilize output) Output voltage/current: 5V/2A Module dimensions: 58mm * 21mm * 10mm (L*W*H) Net weight: 13g Instructions for use: After power-on, the voltmeter displays, if you need to charge such devices as phone, PC, MP3, press the "Output Enable" button, then the USB power indicator lights, USB output 5.0V; if you need to turn off the digital display, press the "low power" button, then enter low-power standby mode and USB output shutdown. Voltmeter calibration method: 1.when the voltage meter display, press "Output Enable" button 2 seconds then release, voltmeter flashes. 2.Touch the "Output Enable" button, the voltage increases 1 unit, touch the "Low Power" button, reduce 1 voltage reduction unit(one unit is less than 0.1V) 3.After the voltage adjustment is completed, please press the "Output Enable" button for 2 seconds then release, exit voltage calibration mode. If power off, parameter setting will automatically save. Applications: 1.Car / motorcycle battery voltage monitor or other voltage measurements 2.USB Charger for Mobile phone, MP3, PC or other electronic products Please Note: This module defaults to D+,D- shorted, compatible with most of cell phone charging, if you need to install identification resistor such as for IPhone, please cut off the red line position Package include: 1x DC/DC Converter Digital Voltmeter Display USB Charger

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DROK® DC-DC Buck Voltage Converter 4.5-40V 12V to 5V/2A Step-down Volt Transformer Stabilizer Voltage Regulator Module Power Supply Switch Inverter Board with LED Voltmeter 5V USB Charger

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Frequently Asked Questions About DROK® DC-DC Buck Voltage Converter 4.5-40V 12V to 5V/2A Step-down Volt Transformer Stabilizer Voltage Regulator Module Power Supply Switch Inverter Board with LED Voltmeter 5V USB Charger in Poland

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