DC-DC 4.5-40V To 5V 2A USB Charger Step down Converter Voltmeter Module
Review: 5 - "A masterpiece of literature" by John Doe, written onMay 4, 20020

DC-DC 4.5-40V To 5V 2A USB Charger Step down Converter Voltmeter Module

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  • Product SKU: KG235
₹ 240.45 ₹ 334.95
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The DC-DC 4.5-40V To 5V 2A USB Charger Step down Converter Voltmeter Module is made of electronic accessories, surface nickel plating (anti-rust), inner conductor: pure copper. It is long-lasting and durable. The module converts an input of 4.5-40V into a very stable 5V 2A output. The device features a USB port through which you can charge your phone. While charging your device please consider that the output of this device is regulated at 5V 2A.

Simply connect this USB Charger Step down Converter Voltmeter Module device to the power supply, the voltage can be detected in real-time. When you need the phone, IPAD, MP3, and other digital products to charge, click the “Output Enable” button, then the USB power indicator lights up and it will start supplying 5V 2A at its output.

When you need to turn off the voltmeter, click the “Low Power” button, then enter the ultra-low-power standby mode, USB output corresponding shutdown. This DC-DC Buck Voltage Converter accepts wide input voltage as from car/battery car/motorcycle used for monitoring battery voltage; measure the voltage needed for a variety of occasions. The output current capability is 5.0V/2A, enough to meet a variety of USB devices.

  • Reduced voltage converter and 5V USB charger port, versatile and practical. 
  • Exit button for USB output and "low power" button for low power mode.
  • With LED indicator for USB power supply and terminal block, easy to operate.
  • It is long-lasting and durable.


This module defaults D + D- short, most of the cell phone charger is compatible, and set aside a variety of mobile phones identification resistor installation location, if you need to add the identification resistor, please connect D + D- wires cut, then added.

Voltmeter Calibration Method

  • Step1: Press the “Output Enable” button more than 2 seconds, release, voltmeter flashes, this time into the voltage regulation mode;
  • Step2: Press the “Output Enable” button (normal speed), the voltage value is adding up a unit; Press the “Low Power” button, minus a unit; Due to a unit is less than 0.1V, the minimum voltage display to 0.1V, so you need to continuously press 1-5 times to see the voltmeter change 0.1V, how many times voltmeter change 0.1V by pressing the button, depending on the current display voltage, the higher the voltage, the fewer the number of press.
  • Step3: press the “Output Enable” button for more than 2 seconds, release, to exit the voltage calibration mode. Data is not lost after the power failure.

Technical Details

  • Input Voltage (V) : 4.5 to 40
  • Output Voltage(V) : 5
  • Max. Output Current (A) : 2

Physical Attributes

  • Length × Width × Height(mm) : 61 × 11 × 13
  • Weight (gm) : 13


  • Cars and Electric Bikes.
  • Motorcycle for voltage measurement and to charge the phone.
  • iPads, Mobile Phones.
  • Mp3 Devices.

Additional Details

  • The voltmeter has an automatic calibration function.
  • With reverse connection protection.
  • With overheat protection and short circuit protection.
  • High efficiency and low ripple.
  • With USB power indicator light.

Product Video

Package Includes

  • 1 x DC-DC 4.5-40V To 5V 2A USB Charger Step down Converter Voltmeter Module

Customer Reviews

Based on 2 reviews
Perfect for turning RC batteries into Power Supplies!

I bought this to power my Pi's without having to plug in. Pi screens normally cover your GPIO pins so there's no easy way to mount the Pi hat batteries. This little step down circuit is overall just handy to have around. Additionally, there is an empty 5V and ground pad on the sides of the USB if you wanted to solder pins on for additional power output. I did this to power a secondary fan for my Pi as the screens tend to run warm with only a single fan.

bhupesh sharma
A great way to get power to Raspberry PI from Creality 3D Pro Printer

I using this buck voltage converter to power a raspberry Pi from a Creality 3D Pro printer. I am setting up Octoprint so I can go wireless to my printer. On Thingiverse they have a case for raspberry PI & buck converter item thing:2889371 to mount to this printer. What I like about this unit is usb connector & digital read out. It's still work a in progress . I have to print out case for raspberry PI.