Our take
Consider the U306 when the three card formats and three USB data ports answer a real import or peripheral need. The key compromise is a seller-reported one-card-at-a-time limit alongside an unconfirmed host connector and an unknown power allowance.
A user who needs USB data ports and CF/SD/TF card access, can verify the host plug, and does not need video or charging pass-through..
Not for confirmed USB-C-only hosts without verifying the upstream plug, simultaneous multi-card access, video, Ethernet, or host charging.
Pros & cons
What could work for you, and what to consider before buying.
What works in its favor
- Three USB 3.0 data ports are listed for model U306.
- CF, SD and TF card slots cover several media types.
- An aluminum enclosure and bus-powered use are described by resellers.
What to weigh up
- A seller limits card access to one card at a time.
- The exact host connector and current Amazon offer are not confirmed.
- No total power budget or host charging feature is documented.
Specifications and exact model details
The key details
| Model covered | U306 |
|---|---|
| Host connector | Exact upstream connector is not settled in the saved seller records |
| USB 3.x data ports | Three USB 3.0 data ports; downstream connector shapes are not confirmed |
| Installation | A reseller lists a 12-inch lead; confirm cable and adapter contents in the offer |
| Hub power | USB bus-powered operation is listed; no total current allowance is given |
| Host charging | No laptop charging, video or network function is documented |
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 hub for USB devices and several card formats
The U306 combines three USB 3.0 connections with a CF/SD/TF card reader in one aluminum enclosure. It suits a desk or travel setup where a computer needs more USB-A ports and a reader for cards from different devices. Its documented layout is more specific than a generic six-in-one label: three ports are USB data connections and three are card formats. This does not mean the card slots all read at once; one inspected seller says to access one card at a time.
Check the host cable and placement
A reseller lists a 12-inch host lead. If the hub needs to reach around a monitor stand or sit at the back of a desktop, check the current listing's cable photo and specification before purchase. The inspected sources describe USB bus power with no separate supply. They do not give a current budget for attached drives, so avoid assuming that several power-hungry devices can run together without issue.
Choose it for data expansion, not laptop charging
The sources describe a USB 3.0 hub and card reader, not a USB-C dock with HDMI or Power Delivery. They do not document video output, network, or laptop charging. Buyers who need those functions should choose another configuration rather than treating the card reader's USB connection as a charging or display feature. The up-to-5Gbps description is a link-rate claim and not a measured speed guarantee.
Verify the U306 label in the offer
Reseller records map the historic ASIN to Rybozen U306, but the current Amazon detail page could not be read. Use the tagged search, then confirm the model label, three USB ports, card formats, host connector and cable length in the offer. This is a source-based assessment with no personal testing or buyer-rating summary.
Treat the card slots as alternatives until concurrency is confirmed
Having CF, SD and TF openings on the same enclosure is useful when a household or work kit mixes camera and removable-media formats. The port count does not establish that each card can be mounted at once, though: one inspected seller explicitly limits access to a single card at a time. If a transfer routine requires copying from two cards simultaneously, this listing does not support that expectation. Confirm the current manual's reader behavior and card support before relying on the six-in-one label, and treat the transfer-rate and card-capacity details as unknown unless the exact offer documents them.
Confirm the upstream plug and power expectations
The sources agree on three USB 3.0 ports, but the saved evidence does not settle the exact host connector for the historical package. Inspect the model label, cable end and any included adapter in the current offer before connecting it to a laptop or other host. Bus-powered operation means the host supplies the hub's power in the described setup; the sellers do not publish a total current budget for attached devices. This makes the U306 a more sensible candidate for ordinary peripherals than for a cluster of drives whose power needs have not been checked. The sources also do not describe video, networking or charging features.
Use the U306 as a data and card accessory, not a dock
The saved layout makes the U306 easier to compare as a peripheral and card accessory: it lists three USB 3.0 ports and CF, SD and TF readers, but does not list HDMI, Ethernet or host charging. A buyer who only needs those data and media connections can judge the port mix without treating the six-in-one label as proof of additional functions. For drive use, compare device power needs with the unreported hub budget. Before travel, inspect the cable end and package because the host connector is not settled for the historic item. Its value depends on accepting the seller-reported one-card-at-a-time behavior and verifying the current unit.
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Before you buy
Can all three card types be read at the same time?
Do not assume that; one inspected seller says only one card can be accessed at a time.
Does the U306 add HDMI or laptop charging?
No video or host-charging function is documented in the saved product sources.
Is the old Amazon listing a confirmed current match?
No. Resellers cross-reference the historic ASIN, but the saved Amazon page was unavailable.
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.
- Sold.ma Rybozen U306 identity and six-function layout ↗ — checked October 5, 2026.
- Sold.ma U306 model/ASIN cross-reference and USB/card-reader configuration ↗ — checked October 5, 2026.
- Desertcart U306 identity, cable, bus-power and port details ↗ — checked October 5, 2026.
- OK Computers U306 card-format description and one-card-at-a-time caveat ↗ — checked October 5, 2026.
- Historical Amazon ASIN; saved cache miss, so current offer mapping is unverified ↗Paid link · We may earn a commission. — checked October 5, 2026.
Is it the right fit?
Check the exact model and today’s offers on Amazon.