USB C to Dual HDMI Adapter 4K@30Hz, KOZYC USB C Hub Multiport Adapter with 2xHDMI, USB 3.0, 100W PD, Support USB C to HDMI Splitter Extended Display for MacBook Pro (MST is not Supported on MacOS)
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AI Verdict
This 1.41-ounce USB-C hub offers dual 4K@30Hz HDMI, 100W PD, and one USB 3.0 port, primarily for Windows users needing two extended displays.
This adapter is a strong fit for Windows users who need to drive two external 4K@30Hz displays and charge their laptop via a single USB-C port. However, its lack of MST support on macOS means Mac users will be limited to mirrored or duplicated external displays, making it a weak fit for those needing true triple-display extension.
If you're a Mac user needing three independent displays, look for adapters specifically stating DisplayLink support, as these bypass macOS's MST limitations.
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Pros
- Drives two external displays up to 4K@30Hz (or 1080P@60Hz) simultaneously.
- Provides 100W Power Delivery passthrough to charge your laptop.
- Includes a single USB 3.0 port for connecting a peripheral.
- Works without drivers on Windows, macOS, Linux, and Android devices supporting DP Alt Mode.
- Weighs 1.41 ounces, making it highly portable.
- Windows users get full MST support for three independent displays (laptop + two external).
Cons
- macOS devices do not support MST, limiting external displays to mirrored or extended-but-duplicated modes.
- HDMI output is limited to 4K@30Hz, which can feel choppy for fast-moving content.
- Only one USB 3.0 port, limiting peripheral connectivity.
- Requires the host USB-C port to support Thunderbolt 3 or DisplayPort Alt Mode.
Dimension Scores
The 1.41-ounce weight makes it easy to carry, supporting mobile setups.
Offers various display modes depending on OS (AAA, ABB, ABC on Windows; AAA, ABB on macOS), but lacks true MST for Mac.
Users describe it as compact and made of aluminum and plastic, suggesting a standard budget build.
Its compact form factor and simple design are functional for an adapter, without standing out.
Best For
- Windows laptop users needing two external 4K@30Hz extended displays.
- Presenters who need to mirror their screen to two HDMI projectors or TVs.
- Users with a single USB-C port who need to charge their laptop and connect two HDMI monitors.
- Travelers needing a lightweight (1.41 ounces) adapter for dual display setups.
Not Recommended For
- MacBook users expecting three independent displays (laptop + two external, all different).
- Users needing higher refresh rates than 30Hz at 4K resolution.
- Anyone requiring multiple USB-A or additional port types like Ethernet or SD card slots.
Watch Out For
- Mac users cannot achieve three distinct displays (laptop + two external) because macOS does not support MST with this adapter; external monitors will either mirror each other or one will mirror the laptop.
- The 4K resolution is capped at 30Hz, which can result in a less fluid experience compared to 60Hz for some users.
- Only one USB 3.0 port means you'll quickly run out of ports if you need to connect a mouse, keyboard, and other peripherals.
- The adapter will not work if your laptop's USB-C port does not support Thunderbolt 3 or DisplayPort Alt Mode.
Full Specifications
| ASIN | B0CGDCGN6Z |
| Brand | KOZYC |
| Color | silver |
| Item Weight | 1.41 ounces |
| Manufacturer | KOZYC |
| Connector Type | USB Type C |
| Operating System | Mac OS 9, Windows 10, Windows 7 |
| Item model number | K1AD14UH |
| Compatible Devices | Laptops, Desktops, Tablets, Smartphones, Monitors |
| Product Dimensions | 2.2 x 1.87 x 0.39 inches |
| Item Dimensions LxWxH | 2.2 x 1.87 x 0.39 inches |
| Item dimensions L x W x H | 2.2 x 1.87 x 0.39 inches |
| Specific Uses For Product | Gaming |
What Buyers Say
Many users, especially those on Windows, find this adapter effectively delivers dual external displays and power passthrough through a single USB-C port. A recurring point of confusion and frustration, particularly for MacBook users, is the lack of true extended display (MST) across two external monitors, meaning they often end up with duplicated screens instead of three independent ones. The 4K@30Hz refresh rate is noted, with some users needing to ensure they have the correct HDMI 2.0 cables for optimal resolution.
“Dude, this thing works for my Windows laptop, finally got my two monitors going, but my buddy with a Mac tried it and was bummed he couldn't get three different screens, so watch out if you're on Apple!”
Common Praise
- Successfully drives two external monitors simultaneously for Windows users.
- Provides 100W Power Delivery to charge the laptop while in use.
- Plug-and-play functionality without needing driver installations.
- Compact and lightweight, making it easy to transport.
- Works for mirroring displays on iPads and Nintendo Switch.
Common Complaints
- MacBooks cannot achieve three independent displays (laptop + two external) due to lack of MST support.
- 4K resolution is limited to 30Hz, which can cause choppiness.
- Only one USB 3.0 port is available, limiting peripheral connections.
- Requires the host USB-C port to support DisplayPort Alt Mode or Thunderbolt 3.
Ownership Tips
- On macOS, the "extended display" mode for external monitors actually means both external monitors show the same content, not two different extensions.
- Using HDMI 2.0 cables is crucial to actually achieve 4K resolution, otherwise, you might be stuck at lower resolutions or refresh rates.
- The single USB 3.0 port fills up fast if you have a mouse, keyboard, and another USB device.
- The adapter can get warm during prolonged use, especially with 100W PD and dual displays.
Frequently Asked Questions
Can I get three independent displays (laptop screen + two different external screens) with this adapter on my MacBook Pro?
No, macOS does not support MST (Multi-Stream Transport) with this adapter, so you cannot have three independent displays. Your external monitors will either mirror each other or one will mirror your laptop display.
What resolution and refresh rate does this adapter support?
It supports up to 4K resolution at 30Hz. It is backward compatible with 2K and 1080P resolutions at 60Hz.
Do I need to install any drivers for this adapter?
No, this adapter is plug and play and does not require any drivers for operation.
Will this adapter work with any USB-C port on my laptop?
No, your laptop's USB-C port must support Thunderbolt 3 or DisplayPort Alt Mode for the adapter to function correctly.
Can I charge my laptop through this adapter?
Yes, it features a 100W Power Delivery (PD) charging port, allowing you to charge your laptop while using the adapter.
Buying Guide
When you're looking at USB-C hubs for external displays, especially dual ones, the biggest thing is understanding how your computer handles multiple screens. Not all operating systems, particularly macOS, let you have three completely separate displays (your laptop screen plus two different external ones) through a single adapter unless that adapter uses special tech like DisplayLink. This adapter uses a standard called DisplayPort Alt Mode, which has different capabilities depending on your OS.
4K@30Hz
This means the adapter can push a lot of pixels (4K resolution), but only updates the screen 30 times per second. For everyday work, it's fine, but if you're gaming or watching fast-paced video, 30Hz can look a bit less smooth than 60Hz.
100W PD (Power Delivery)
This is how much power the adapter can pass through to charge your laptop. 100W is enough for most modern laptops, so you can use the adapter and charge your computer with just one cable.
DisplayPort Alt Mode (DP Alt Mode)
This is a feature of your USB-C port that allows it to carry video signals. If your laptop's USB-C port doesn't have this, or Thunderbolt 3, this adapter won't work for video output.
Alternatives
If you need true triple extended displays on a Mac, look for a USB-C hub that explicitly states "DisplayLink" technology. If you need more USB ports or higher refresh rates, search for hubs with more USB 3.0/3.1 ports or HDMI 2.0/DisplayPort 1.4 outputs.
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