Our take
HB-R3MB is a compact three-port USB-A data hub with a built-in plug that rotates 90 or 180 degrees. Its combined 5V/0.9A limit and sync-only behavior make it a poor match for charging phones or running high-draw storage.
A USB-A computer with nearby low-power peripherals where three USB 3.0 connections and a rotating plug may help with port orientation..
Skip it if you need USB-C host input, four or more ports, high-draw external drives without their own power, or USB charging from the hub.
Pros & cons
What could work for you, and what to consider before buying.
What works in its favor
- Sabrent and B&H identify the exact HB-R3MB model.
- Three USB-A 3.0 ports and a built-in host connector with 90/180-degree rotation are specified.
- B&H states the combined power limit and warns that the hub syncs rather than charges.
What to weigh up
- USB-A host does not directly suit USB-C-only computers.
- The 5V/0.9A combined device limit is restrictive for higher-draw peripherals.
- The historical Amazon ASIN and current offer are not verified.
Specifications and exact model details
The key details
| Model covered | HB-R3MB |
|---|---|
| Host connector | Built-in USB-A host connector |
| USB 3.x data ports | Three USB-A 3.0 data ports |
| Installation | Compact rotating plug; 90/180-degree adjustment listed |
| Hub power | Bus-powered; combined 5V/0.9A device load limit |
| Host charging | Does not charge connected devices per B&H |
Performance figures are manufacturer claims. Source checked October 4, 2026. Regional models and included accessories can differ.
Full review: how the features affect your choice
What the features mean for you
Add three ports from a built-in rotating USB-A plug
The HB-R3MB is a compact-style expansion choice for a computer that has a suitable USB-A host port and needs a few additional USB connections. Sabrent and B&H identify three downstream USB-A 3.0 ports and a built-in host connector that can rotate 90 or 180 degrees. That swivel is the product's main physical distinction: it can change how the hub sits relative to the side of a computer or the direction of its ports. The source does not establish fit with every laptop chassis, so check the host port position and clearance before expecting a particular orientation to work comfortably.
Match the three-port USB generation to the attached devices
B&H lists USB 3.0 / USB 3.2 Gen 1 and an interface rate up to 5Gbps. That gives the hub a higher-speed class than a USB 2.0 splitter, but the number is a host-interface maximum rather than a test result for all three sockets used together. The available pages do not report a file-copy benchmark or explain controller sharing under simultaneous load. Buyers connecting storage should confirm that the laptop's host port and external drive support the same generation, then treat actual copy rates as dependent on the complete chain. The three USB ports expand connection count, not independent guaranteed bandwidth.
Keep the power limit in view
B&H describes the HB-R3MB as bus-powered and gives a combined load limit of 5V at 0.9A for stable connection. It specifically recommends an external power source for hard drives. That is a meaningful boundary for a small bus-powered hub: it is suited to planning several lower-demand data peripherals, but it is not documented as a replacement power supply for demanding storage or a group of high-draw devices. The product note also says it synchronizes devices rather than charging them. If the goal is charging phones or running powered disks, use equipment designed and rated for that job instead of interpreting “USB hub” as a charger.
Consider it for rotation and portability, not as a dock
Sabrent presents HB-R3MB as a mini rotating hub and B&H lists an aluminum enclosure and built-in host connector. The cited pages do not list HDMI, Ethernet, card reading, Power Delivery or a separate adapter for this model. Buyers should therefore compare it as a three-port peripheral expander, not with multiport USB-C docking stations that supply displays and laptop charging. The swivel may help when the host port is awkwardly placed, but actual cable access depends on nearby plugs and the host's layout. No durability, hinge-life or personal-handling claim can be inferred from the rotating design description.
Search by model and check the current offer
HB-R3MB is explicitly named by Sabrent and B&H, making it a useful search term. The row's old Amazon page did not provide current listing content, so B08TCCVSMZ is not used as a direct product link. The tagged exact-model search should be followed by checking the offered item's model code, black rotating connector, three downstream USB-A ports and the combined-power warning. B&H lists Windows, macOS and Linux support, but a managed or specialized machine may still have driver or hardware requirements that should be checked with its manufacturer. This review relies on documented product specifications and contains no personal test, buyer-review summary, current price, stock or sales claim.
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Before you buy
How many downstream ports?
The model-specific sources identify three USB-A 3.0 data ports.
Can the hub charge connected phones?
B&H says it synchronizes devices rather than charging them.
What is the listed load limit?
B&H gives a combined connected-device limit of 5V/0.9A.
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.
- Sabrent official HB-R3MB page and B&H model-specific listing ↗ — checked October 4, 2026.
- Sabrent official product page: model/SKU, rotating hub, product and package details ↗ — checked October 4, 2026.
- B&H model-specific listing: ports, bus power, combined 5V/0.9A limit, external-drive and no-charging notes ↗ — checked October 4, 2026.
- Historical Amazon ASIN returned a cache miss; current exact offer not confirmed ↗Paid link · We may earn a commission. — checked October 4, 2026.
Is it the right fit?
Check the exact model and today’s offers on Amazon.