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Targus DOCK423TT Review 2026 - Specs, Pros & Cons

7 Very Good
Adrian Cel By Adrian Cel

The Targus DOCK423TT is a portable USB-C Alt Mode dock for people who want two HDMI outputs without carrying a full desktop brick. Targus sells it as the USB-C Dual HDMI 4K Docking Station with 100W PD Pass-Thru, model DOCK423TT. The small silver adapter uses a built-in 7-inch USB-C host cable, two HDMI 2.0 ports, one USB-C 3.2 Gen 1 data and power input port, two USB-A 3.2 Gen 1 ports, Gigabit Ethernet, SD and microSD UHS-I card readers, and pass-through USB-C Power Delivery up to 100W when you connect a separate USB-C charger. It is not a DisplayLink dock. Video comes from the host's native USB-C DisplayPort Alt Mode signal, so there is no display driver to install, but the laptop or tablet must support Alt Mode. On Windows and ChromeOS hosts with MST support, Targus lists dual extended HDMI output up to 4K@60Hz. On MacBooks, the two HDMI outputs mirror each other rather than creating two independent extended displays, and Targus separately warns that M1 MacBooks had unstable connectivity in its compatibility note. That makes the DOCK423TT a strong travel or hot-desk adapter for Windows USB-C laptops, Chromebooks, Samsung DeX setups, and some tablets. It is a much weaker choice if you need reliable dual extended monitors from a MacBook.

Best portable Targus USB-C Alt Mode dock

Pros & Cons

What We Like

  • Dual HDMI 2.0 outputs can run up to two 4K@60Hz displays on compatible Windows and ChromeOS MST hosts
  • 100W USB-C Power Delivery pass-through supports high-power ultrabooks when paired with a suitable charger
  • No DisplayLink driver is needed for video output
  • Compact 7-inch tethered cable design is easy to travel with
  • Includes Gigabit Ethernet plus SD and microSD UHS-I readers, which many small hubs skip
  • Three-year Targus warranty is good for a portable adapter in this price range

What Could Be Better

  • MacBooks mirror the two HDMI ports instead of providing dual extended displays

    Workaround: Use the DOCK423TT for one Mac display or mirrored presentation output. For two extended Mac displays, choose a Thunderbolt dock on Pro/Max chips or a DisplayLink dock if drivers are acceptable.

  • USB-C charger is not included, so 100W pass-through depends on the power adapter you bring

    Workaround: Use a charger with enough headroom for the laptop plus roughly 15W for the dock.

  • Only two USB-A ports, and only one supports BC 1.2 charging

    Workaround: Use it as a travel dock, not as a full desktop replacement for many USB peripherals.

  • 4K@60Hz and dual-display behavior depend heavily on the host graphics path

    Workaround: Confirm USB-C DP Alt Mode and MST support on the laptop before buying. If displays blink or go black, test 4K@30Hz or lower resolution.

  • Several field reports mention quirks with video outputs, sleep, or switching off one monitor

    Workaround: Test both HDMI ports during the return window, update graphics and USB-C controller firmware, and keep the three-year warranty details handy.

Display Support

Max Displays: 2
1 display (Single 4K@60Hz through either HDMI 2.0 port on a compatible USB-C DisplayPort Alt Mode host. Targus also tags the product for up to 5K single-video filtering, but the documented HDMI output is 4K@60Hz.)
3840x2160 @ 60Hz
2 displays (Dual 4K@60Hz is supported over MST on compatible Windows and ChromeOS hosts. Some host and monitor combinations may need 4K@30Hz instead.)
3840x2160 @ 60Hz
2 displays (MacBooks mirror the two HDMI outputs using SST rather than providing two independent extended desktops. Base M1 MacBooks may render only one external monitor.)
3840x2160 @ 60Hz

Ports & Connectivity

USB Ports

1x USB-C 3.2
2x USB-A 3.2 7.5W

Video Outputs

2x HDMI 2.0

Network

1x Ethernet (1 Gbps)

Card Readers

1x SD (SD 3.0 / UHS-I)
1x microSD (SD 3.0 / UHS-I)

Full Specifications

General
Manufacturer Targus
Model DOCK423TT
Release Date 2021-02
MSRP $104.99
Connectivity
Host Connection USB-C
Max Data Rate 5 Gbps
Driver Required No (native)
Display Output
Max Displays 2
1x Display 3840x2160 @ 60Hz (Single 4K@60Hz through either HDMI 2.0 port on a compatible USB-C DisplayPort Alt Mode host. Targus also tags the product for up to 5K single-video filtering, but the documented HDMI output is 4K@60Hz.)
2x Display 3840x2160 @ 60Hz (Dual 4K@60Hz is supported over MST on compatible Windows and ChromeOS hosts. Some host and monitor combinations may need 4K@30Hz instead.)
2x Display 3840x2160 @ 60Hz (MacBooks mirror the two HDMI outputs using SST rather than providing two independent extended desktops. Base M1 MacBooks may render only one external monitor.)
Ports (5+ total)
USB-C 3.2 1x
USB-A 3.2 2x (7.5W)
HDMI 2.0 2x
Ethernet (RJ45) 1x 1 Gbps
SD Card Reader 1x
microSD Card Reader 1x
Power
Power Input USB-C
Laptop Charging Up to 100W

Compatibility

Windows (10+)

Best fit for the dock. Dual extended displays use DisplayPort MST from a USB-C Alt Mode or Thunderbolt host. Some systems may require reconnecting the dock or rebooting to detect the second monitor.

macOS

Targus lists MacBook support, but dual external monitors mirror each other over SST. The compatibility note also flags unstable connectivity on M1 MacBooks.

ChromeOS

Supported on Chromebooks with USB-C DisplayPort Alt Mode. Display modes depend on the Chromebook's graphics and firmware.

Linux

Targus lists Linux platforms that support USB-C Alt Mode and Power Delivery. Ethernet may need Realtek or ASIX driver support depending on the hardware revision.

Android

Supported on Android platforms with Type-C Alternate Mode, including Samsung DeX devices. DeX renders to a single external desktop.

Known Issues

USB-C ports without DisplayPort Alt Mode

No HDMI output

MacBooks that need two extended external displays

Dual HDMI mirrors instead of extending

M1 MacBooks

Unstable connectivity reported by Targus

Hosts or monitors without enough bandwidth for 4K@60Hz

Lower display mode required

Setups without a USB-C Power Delivery charger

No laptop charging from the dock

7 /10

Our Verdict

Very Good

The DOCK423TT is closer to a serious USB-C hub than a traditional docking station, and that is not a bad thing. It costs around $105 at Targus, shows up around $76 at CDW at the time of review, and gives you the ports most travel hubs leave out: two HDMI 2.0 outputs, Ethernet, both SD card sizes, and 100W pass-through charging. Laptop Mag liked it enough to give it an Editor's Choice review in 2022, calling out the broad device support, travel-friendly size, dual 4K@60Hz support, card readers, and power delivery. CDW's user-review feed is more mixed at 4.3 out of 5 from 30 reviews: several buyers praised the simple work-from-home setup, but one six-month report said both video outputs stopped working, and another search snippet from Staples mentioned awkward behavior when turning off one of two displays. I would buy it for a Windows ultrabook or Chromebook that already supports USB-C DP Alt Mode and needs HDMI monitors on the road. I would not buy it as a Mac dual-monitor fix, because macOS uses mirrored SST on the two HDMI ports and Targus's own compatibility note flags M1 stability issues. I would also skip it for high-refresh gaming, USB-A legacy desks, or laptops that need a bundled power supply. Bring your own USB-C charger, check your host's display specs, and treat the 4K@60Hz claim as host-dependent rather than automatic.

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Frequently Asked Questions

Does the Targus DOCK423TT require DisplayLink drivers?
No. The DOCK423TT uses USB-C DisplayPort Alt Mode, not DisplayLink. That keeps setup simple, but it also means the host must support native video output over USB-C.
Can the DOCK423TT run two 4K monitors?
Yes, on compatible Windows and ChromeOS hosts with USB-C DisplayPort Alt Mode and MST support. Targus lists up to dual 4K@60Hz through the two HDMI 2.0 ports, but some host and monitor combinations may need 4K@30Hz.
Does the Targus DOCK423TT work with MacBooks?
It can work for basic USB-C Alt Mode output, USB, Ethernet, card readers, and charging, but it is not a good Mac dual-monitor dock. Targus says MacBooks mirror the two HDMI outputs over SST, and its compatibility note flags M1 MacBook stability issues.
Does the DOCK423TT include a power adapter?
No. The dock supports up to 100W USB-C Power Delivery pass-through, but the USB-C PD charger is sold separately. Use a charger with enough power for both the laptop and the dock.
What is the difference between the DOCK423TT and Targus DOCK310USZ?
The DOCK423TT is a portable driverless USB-C Alt Mode adapter with 100W pass-through charging and no included power brick. The DOCK310USZ is a larger DisplayLink desktop dock with its own power supply, 65W laptop charging, and broader dual-display support on Macs through DisplayLink software.

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