This article covers StarTech.com Thunderblot 3 ハブ サンダーボルト3ミニドック デュアル 4K.

Overview

The StarTech.com TB3DKM2HDL is a compact Thunderbolt 3 mini dock that brings dual 4K60Hz HDMI video output, two USB-A ports (one 5Gbps and one 2.0), and Gigabit Ethernet to your laptop via a single Thunderbolt 3 cable. Its 28cm integrated cable keeps your desk tidy, and because it's bus-powered, you don't need a separate power adapter. This makes it an excellent companion for MacBook or Windows laptops that need extra display connectivity and stable wired networking. Positioned as a mid-range Thunderbolt 3 dock, it delivers dual 4K at 60Hz without compression—ideal for creative workflows like video editing or stock trading. It lacks a pass-through charging port, so you'll still need your laptop's original power brick, but that's a trade-off in exchange for its small footprint and portability.

Connectivity & Compatibility

This dock is designed for Thunderbolt 3 or USB4 hosts. It works with Windows, macOS, and Ubuntu laptops that have a Thunderbolt 3 port. However, base-model M-series MacBooks (non-Pro/Max) and iPad Pro (M1 and later) only support single display output over Thunderbolt; only MacBook Pro with M1 Max/Pro or later chips can drive dual 4K displays. On the Windows side, most Thunderbolt 3 notebooks will handle dual 4K60Hz without issue. The HDMI ports support up to 4096×2160 at 60Hz per display. There are two USB-A ports: one USB 3.2 Gen 1 (5Gbps) and one USB 2.0. The Gigabit Ethernet port supports PXE boot and Wake-on-LAN. There is no DisplayPort or VGA output, and no SD card reader. The dock does not provide power delivery to the host, so your laptop must be charged separately.

Product Info

The StarTech.com TB3DKM2HDL was released around 2021 and continues to be sold. Its typical retail price in Japan is around ¥13,680 on . The product comes with a 3-year warranty and free lifetime technical support from StarTech. The box contains only the dock unit; no cables or power adapters are included (except the integrated Thunderbolt 3 cable). In the broader dock market, this unit fits the mid-range category: it offers dual 4K60Hz and essential ports but skips high-power passthrough, DisplayPort, and multi-card readers. It's a practical choice for users who already have Thunderbolt 3 laptops and need basic expansion without spending on a full-featured, expensive Thunderbolt dock.

Best Use Cases

Creative professionals—especially editors and designers who run dual 4K monitors—will appreciate the uncompressed video output. The Thunderbolt 3 bandwidth easily handles both displays plus USB peripherals simultaneously. But if you need to charge your laptop through the dock or require DisplayPort, look elsewhere. Office workers with company-issued Thunderbolt 3 laptops can quickly set up a dual-screen home office with wired Ethernet. Since the dock is bus-powered, you don't need an extra power outlet. However, if your laptop only has a standard USB-C port (not Thunderbolt), this dock won't work. Travelers who need a lightweight expansion solution will love the small footprint and attached 28cm cable. No power brick means less to pack. Just remember to bring two HDMI cables. If you often work in co-working spaces or airport lounges, this dock can turn any single-display laptop into a dual-monitor workstation—as long as you have access to external monitors.

Product Disclosure (Amazon)

  • Manufacturer: StarTech.com(スターテック)
  • Seller: PLEX
  • Fulfilled by: PLEX
  • ASIN: B08KJJG7SZ
  • Note: This article covers a manufacturer-made product based on Amazon listing details.