Our take
Choose the DKT31CMDPHPD when one screen, four USB data connections and a longer attached lead solve the actual desk setup. Its key trade-off is that video mode depends on the host's DP Alt Mode version, while laptop charging needs a separate compatible USB-C supply.
A USB-C laptop or tablet with DP Alt Mode that needs one external display, four data connections and optional host charging through a separate compatible charger..
Not for dual independent displays, USB-C hosts without DisplayPort Alt Mode, or buyers who expect the charger to be included.
Pros & cons
What could work for you, and what to consider before buying.
What works in its favor
- Exact Amazon model and ASIN association is documented.
- Four data ports and two alternate one-screen video connectors are specified.
- Up to 85W host power is described after the adapter's 15W allowance.
What to weigh up
- Only one HDMI or Mini DisplayPort display is active at a time.
- USB-C video requires DP Alt Mode and the refresh ceiling depends on DP version.
- A separate compatible USB-C charger is needed for pass-through charging.
Specifications and exact model details
The key details
| Model covered | DKT31CMDPHPD |
|---|---|
| Host connector | USB-C host with DP Alt Mode required for video |
| USB 3.x data ports | Four data ports: three USB-A and one USB-C; up to 10Gbps group claim |
| Installation | 12-inch attached host cable; select HDMI or Mini DisplayPort for one screen |
| Hub power | Bus power or separate USB-C PD input; up to 100W input claim |
| Host charging | Up to 85W to the host after the adapter's 15W allowance; charger is separate |
Performance figures are manufacturer claims. Source checked October 5, 2026. Regional models and included accessories can differ.
Full review: how the features affect your choice
What the features mean for you
A small workstation adapter with a longer lead
The DKT31CMDPHPD combines a wired display connection, four USB data ports and laptop charging pass-through in one USB-C adapter. Its 12-inch attached cable is longer than the short leads used on many compact dongles, which can help when the host sits on a riser or when a tablet's port should not carry the adapter's weight. Amazon's product page confirms the exact model/ASIN association, so the tagged direct link is appropriate for this profile.
Choose HDMI or Mini DisplayPort for one screen
The product offers HDMI or Mini DisplayPort video, not two independent video outputs at once. The listing says a DP 1.4 Alt Mode host can support up to 4K at 60Hz; with DP 1.2 Alt Mode it lists up to 4K at 30Hz. Check the host specifications before buying: a USB-C port that supports data or charging only will not supply the video signal this adapter needs. The host, display and cable all affect the result, so treat those figures as supported configurations rather than a guarantee for every laptop.
Four data ports plus a distinct charging input
StarTech's description lists three USB-A data ports and one USB-C data port, each in the adapter's 10Gbps hub group. A second USB-C socket is for Power Delivery input, not another general data port. The listing says the adapter can be bus powered or use an external USB-C supply; up to 100W enters, while 15W is reserved for the adapter and up to 85W remains for the laptop. A compatible PD charger is not listed in the package contents, so budget for your own if pass-through charging is needed.
Know the host and display constraints
This model is for a laptop or tablet with USB-C video capability and, for full pass-through charging, a compatible PD connection. It supports one external display. If your requirement is dual independent monitors, this is not the right configuration. Before purchase, compare the model code and port labels with the current listing instead of relying only on a generic “USB-C dock” title.
A clearly identified model with limits worth checking
This is a good fit to investigate when one display, four USB data ports and a longer built-in lead address the actual desk setup. The most important checks are host DP Alt Mode version, the desired output connector and whether the charger is already available. The specifications are manufacturer/listing claims, not my own test results; this review does not summarize customer feedback or current pricing.
Check the display path before choosing a mode
The 4K figures describe different host configurations rather than a universal output promise. A DP 1.4-capable computer is listed for up to 4K at 60Hz, while DP 1.2 is listed for up to 4K at 30Hz. The monitor, cable and operating system also need to support the chosen mode. If a work routine depends on a particular refresh rate, verify the computer specification and use the video connector that matches the monitor before ordering. The alternative Mini DisplayPort socket offers a connector choice; it does not add a second screen path.
Budget for the charger and the cable's reach
This adapter is easier to evaluate when the buyer separates the hub's input rating from the amount delivered to a laptop. StarTech's allowance leaves up to 85W for the host, and the product description says the supply is separate. That arrangement can suit a desk where a compatible charger is already available, but it does not replace checking the laptop's own charging requirement. The attached 12-inch lead may help position the adapter beside a stand or a tablet, though it is still a fixed cable rather than a detachable extension. Confirm those two practical details along with the exact model label.
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Before you buy
Can HDMI and Mini DisplayPort drive two monitors independently?
No. The listing describes one display at a time, using either HDMI or Mini DisplayPort.
Is the USB-C PD socket also a data port?
No. StarTech lists a separate USB-C data port and a distinct USB-C PD input.
How much power can reach the computer?
The listing says up to 85W after reserving 15W from a 100W PD input for the adapter.
Where can I check the current price?
Use the Amazon link for current offers. Check the exact model, seller, product condition, delivery, and return terms. This page does not display a live price or confirm stock.
Sources and review basis
Sources & review basis
We use the linked product documentation for the features above. Our suitability notes and buying advice are editorial judgments based on those features, not measured performance results.
- StarTech DKT31CMDPHPD official product specifications ↗ — checked October 5, 2026.
- StarTech official DKT31CMDPHPD identity, ports, DP modes and power specification ↗ — checked October 5, 2026.
- Amazon page matching ASIN B09BDBN46Z to DKT31CMDPHPD ↗Paid link · We may earn a commission. — checked October 5, 2026.
- Amazon US model listing checked October 5, 2026; current condition, price, and availability are confirmed by the seller.
Is it the right fit?
Check the exact model and today’s offers on Amazon.