We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Compact USB-C to 4.0x1.7mm barrel adapter with built-in LED wattage display

Fervit

Fervit USB-C to DC 4.0x1.7mm Adapter 100W PD with Wattage Display

SKU CH-1E2C-79RDG

Converts a USB-C PD charger into a 4.0 × 1.7 mm barrel power source up to 100 W with a real-time voltage, current and wattage display

  • Real-time power monitoring with LED voltage, current and wattage display
  • Up to 100W Power Delivery via USB-C PD and QC 2.0/3.0 support
  • DC 4.0×1.7mm barrel output delivers 20V at 5A for laptop charging
  • Compact alloy shell protects the plug and enables plug-and-play use
  • Works with most USB-C chargers and DC laptops — verify jack size first

Fervit USB-C to DC 4.0x1.7mm Adapter 100W PD

This adapter converts a USB-C Power Delivery source into a 4.0x1.7mm barrel output for laptops. It supports up to 100W at 20V/5A and includes an LED display showing real-time voltage, current and wattage. The alloy shell protects the connectors during transport. It is aimed at users who want to power a barrel-jack laptop from a modern USB-C charger.

Check your laptop DC jack size and power needs

Verify that your laptop uses a 4.0x1.7mm DC input and requires 20V within the 18.5V to 20.5V range. The USB-C charger and cable must each be rated for 100W or higher to reach the maximum output. Lower rated chargers will still work but deliver less power, such as 65W. The adapter is plug-and-play with no drivers required.

Replaces a proprietary barrel charger

This adapter lets you replace a dedicated barrel-style power brick with a universal USB-C PD charger rated at 100W. The jump is worth it when you want one charger for multiple devices or need a smaller travel kit. It is not for laptops that need a different barrel size, a voltage outside the 18.5V to 20.5V window, or more than 100W of power.

Highlights

  • Real-time power monitoring with LED voltage, current and wattage display
  • Up to 100W Power Delivery via USB-C PD and QC 2.0/3.0 support
  • DC 4.0×1.7mm barrel output delivers 20V at 5A for laptop charging
  • Compact alloy shell protects the plug and enables plug-and-play use
  • Works with most USB-C chargers and DC laptops — verify jack size first

Specifications

BrandFervit

Questions about this item

Does the adapter come with a USB-C charger or cable, or do I need to buy them separately?

The adapter itself is the only item included; you must supply a USB-C charger and cable rated for 100W or higher to reach the maximum 20V 5A output.

My laptop needs a 4.0 x 1.7 mm barrel jack — will this adapter fit, or should I choose a different size?

This model has a fixed DC male plug of 4.0 x 1.7 mm; it will only fit laptops that use that exact barrel-jack size.

The headline says 100W — what does that actually deliver when I plug it into my laptop?

With a 100W-capable charger and cable, the adapter passes up to 20V at 5A (100W) to the DC jack; it also negotiates 65W and voltages between 18.5V and 20.5V depending on the source.

New to this? Which coin should you pay with — what to check, what it costs to pay, and what is never asked for.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.