JSAUX HB0603 Dock Review: Two Docks, One Model Number

For a handheld that spends part of its life connected to a television, this is a good dock at a fair price. It also carries a documentation problem serious enough to lead a review with: two different products ship under the model number HB0603, and they differ in the specification most buyers are choosing on.

A note on this assessment: researched from JSAUX's published specifications, not connected to a handheld here. See how we test.

The revision problem, first

JSAUX has sold two versions of the HB0603. The earlier one is HDMI 2.0, capped at 4K and 60 Hz. The current one is HDMI 2.1, specified at 4K and 120 Hz. The model number did not change, the physical design is very similar, and both remain in circulation through retailers and remaining stock.

If refresh rate is why you are buying, the model number is not sufficient information. Read the individual listing's stated specification, and where the listing gives no refresh figure at all, treat that as the older revision rather than the newer one. This is not a hypothetical: it is the exact way someone ends up with a 60 Hz ceiling on a 120 Hz television and no idea why.

Nothing else in this review is affected by the revision. Everything below applies to both.

The problem it addresses

A handheld gaming PC has one USB-C port and, in docked use, four jobs for it: display out, power in, wired network, and whatever keyboard, mouse or controller receiver the session needs. One connector cannot do all four without something in the middle.

A hub can do it. What a dock adds is the stand — the handheld is held at a viewing angle, the connector is not being levered against by the weight of the device, and the whole assembly stays where you put it. The trade against a bare adapter is set out in handheld dock vs travel adapter.

How it is specified

USB

3 x USB-A 3.0

Model

HB0603

Display

HDMI

Network

Gigabit Ethernet

Charging

100 W USB-C Power Delivery pass-through

Revision

Current revision is HDMI 2.1 at 4K/120 Hz; an earlier HB0603 shipped HDMI 2.0 at 4K/60 Hz

What it gets right

The port selection is well judged for the actual use case. Three USB-A 3.0 ports is one more than most docks and exactly the number a wireless receiver, a wired keyboard and an external drive need at once. Gigabit Ethernet is the port that most changes the experience, because a hundred-gigabyte install over a marginal wireless link is the single most frustrating thing about the platform.

The 100 W pass-through ceiling exists so the dock is never the limiting factor: the handheld takes what it negotiates, the peripherals take theirs, and the headroom absorbs both. And the cradle geometry means one motion connects everything, which is what makes a dock get used rather than left in a drawer.

Ugly score 4, and it earns it — quietly

A small matte black wedge with a slot in it. On a TV stand it reads as a set-top box, and unlike most things reviewed here it was clearly styled rather than merely assembled.

Four rather than lower because of what it does to the desk it sits on: a dock is a junction, and the back of it is four cables converging on a small object. On a TV stand that is invisible; on a desk it is a knot in the middle of a surface you look at, and the answer is the same as everywhere else in the desk section — deal with it at installation rather than after.

Where it stops being the right tool

One connector, shared

Display, network and USB all travel over a single USB-C link to the handheld. That bandwidth is divided between them, not added to them, so a 4K feed and a fast external drive are competing rather than coexisting. For controllers, keyboards and Ethernet it is a non-issue; for high-bandwidth capture or fast storage it is the ceiling.

Cases, and the recessed port

The cradle expects the handheld's own dimensions. A thin shell generally clears; a grip case or a rugged shell generally does not, and the compromise is taking it off for docked sessions. The wider protection question is in protecting a handheld gaming PC.

It does not come with power

The dock passes power; it does not supply it. A charger sized for the handheld alone will run short once the dock is also feeding peripherals, and the resulting symptom is a handheld that discharges slowly while apparently plugged in. The sizing rules are in charging a handheld properly.

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Who should buy it, and who should not

Buy it if the handheld regularly plays on a television or a monitor, and especially if the wireless where it lives is unreliable. The Ethernet port alone justifies it for anyone downloading modern game installs, and the port count covers a docked session properly.

Skip it if docked use means a screen and nothing else — a plain USB-C to HDMI adapter is a fraction of the price, weighs nothing and travels better. The full kit question is in handheld kit that earns its bag space.

Would we buy it again?

Yes, with the listing read carefully. The dock is good; the model numbering is not, and the burden of that falls on the buyer. Confirm the revision, size the charger, and it is one of the better-value handheld purchases available.