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Short braided cable with barrel plug USB-C connector and small LED display block

Fervit

Fervit DC Jack 4.5x3.0mm to USB-C 140W LED Display Cable 21cm

SKU CH-KH17-TCXY4

A 21 cm cable converts a 4.5×3.0 mm DC barrel jack to USB-C, delivering up to 140 W with an LED readout of voltage, current and power

  • Charges up to 140W with 20V 7A output
  • Real-time voltage, current and power shown on LED display
  • Works with Mac Pro 2020 2019 2018, XPS, Chromebook and other 20V 9V 5V USB-C devices
  • Braided tangle-free jacket, 21cm length, plug-and-play flexibility
  • Supports PD QC2.0 QC3.0 DCP PE+1.1 PE2.0 FCP AFC SFCP SCP protocols

DC-to-USB-C power cable with live wattage display

This 21 cm cable converts a 4.5 x 3.0 mm DC barrel jack into a USB-C plug capable of delivering up to 140 W. An integrated LED screen shows real-time voltage, current and power so users can verify charging rates at a glance.

For USB-C laptops and tablets that accept 20 V input

The adapter suits owners of compatible MacBook Pro, XPS, Chromebook or similar 20 V USB-C devices who want to reuse an existing DC power brick. It will not work for hardware that requires a different barrel size, a higher voltage than 20.5 V, or more than 140 W total throughput.

Single specification that decides fit: the 4.5 x

Only power supplies fitted with that exact centre-positive barrel connector can plug into this cable. Buyers must confirm their charger tip matches those dimensions before purchase; no other barrel size is supported.

Highlights

  • Charges up to 140W with 20V 7A output
  • Real-time voltage, current and power shown on LED display
  • Works with Mac Pro 2020 2019 2018, XPS, Chromebook and other 20V 9V 5V USB-C devices
  • Braided tangle-free jacket, 21cm length, plug-and-play flexibility
  • Supports PD QC2.0 QC3.0 DCP PE+1.1 PE2.0 FCP AFC SFCP SCP protocols

Specifications

BrandFervit

Questions about this item

How do I connect the 4.5x3.0mm DC jack and USB-C ends without damaging the LED display?

Plug the DC jack into a 15-20.5V source first, then connect the USB-C end to your laptop; the 21cm braided cable is fully plug-and-play with no drivers required.

What part of this cable is most likely to wear out and need replacement?

The woven braid sleeve and DC jack contacts endure repeated mating cycles; the inline LED display module is solid-state and has no user-serviceable components.

At what power level does the cable hit its thermal or protocol limit during sustained charging?

The hard ceiling is 140W at 20V/7A; if the source or device negotiates only 100W or 65W, the cable simply passes the lower negotiated power.

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