Every household has a charging drawer, and inside it sits the usual graveyard of half working adapters. You find a cube that fits one device, a cable that refuses to fast charge, and nothing that keeps two phones happy at the same time. The 2 pack of 20W USB C charger blocks tries to fix that with A Simple promise: two compact cubes, two USB C ports on each, and enough power to top up a phone in a hurry. I ran both cubes through daily life for several weeks, charging iPhones, Samsung handsets, a pair of earbuds, and a tablet, and this review covers how fast they charge, how they split their power, and where the 20W ceiling shows up.
Before the details, the standard note. This article contains affiliate links, and if you buy through one of them the site earns a small commission at no extra cost to you. That commission does not change what I test or what I recommend. The charger blocks reviewed here were used exactly the way you would use them, plugged into the same wall outlets you would reach for.
The cube is a common shape in the charging world, a small box that plugs straight into the wall with no cord in the way. The rest of this review walks through the build, the ports, the real charging numbers, and the comparison that matters when you shop for a spare adapter.
Design and Build
Each cube is a rounded square, roughly the size of a large ice cube, with the two USB C ports sitting on the face opposite the prongs. The shell is glossy white plastic with a clean finish, and the compact body stays flush against the outlet plate, which means the adapter does not block the socket beside it. On a power strip with wide spacing, two cubes sit side by side without crowding, which is more than you can say for the oversized bricks that still ship with many devices.
The prongs are fixed, so there is no folding mechanism to break and no hinge to loosen over time. The whole cube has a solid, dense feel in the hand, and the USB C ports grip a cable connector firmly without that loose wobble that cheap adapters develop after a week. Both cubes behave identically in this respect, which matters for a two pack, because a matched pair should not have one Reliable unit and one dud.
Key Features
The headline feature is the dual USB C output. Two ports on one 20W adapter mean a phone and a pair of earbuds charge at the same time from a single outlet, which cuts down on the pile of cubes accumulating on the nightstand. Each cube delivers up to 20W on a single port, which is the sweet spot for iPhone fast charging and for most Samsung handsets.
The USB Power Delivery profile is the quiet part of the spec that does the heavy lifting. The adapter negotiates with each connected device and feeds it the voltage it asks for, so a phone that wants 9V fast charging gets it, and an older device that only draws 5V stays safe. The result is that the same cube charges an iPhone 14 at full speed, a Samsung handset at its rate, and a set of wireless earbuds at a gentle trickle, all without any manual switching.
Real-World Performance
The real test is time to full, so I measured it. An iPhone 14 sat at 8 percent, plugged into one cube on its own, and reached 55 percent in roughly 30 minutes, which matches the fast charging curve Apple promises for a 20W adapter. A Samsung Galaxy phone climbed from 12 percent to 66 percent over the same window. Those numbers are exactly what a 20W cube should deliver, no more and no less, and they make the adapter a genuine upgrade over the ancient 5W bricks that many of us still use at the bedside.
With both ports occupied, the power splits. A phone and a pair of earbuds on the same cube both charged steadily, with the phone gaining about 38 percent in half an hour while the earbud case filled from empty. The split is handled cleanly, with no negotiation hiccups and no dropped connection, and I never saw one port starve the other. The total remains 20W, so two hungry devices each run slower than one would alone, which is physics, not a flaw.
Heat management earned quiet respect over the testing period. After a long charging session, the cube ran warm but never hot, and it did not drop to a trickle to protect itself, which is a behavior you see in cheap adapters that throttle hard when they get warm. The plastic shell stayed cool enough to unplug comfortably, and repeated sessions did not loosen the ports or yellow the casing.
The limits are real and worth naming. At 20W, this adapter is not for a laptop, and it will not fast charge an iPad Pro at the rate a 30W or higher adapter would manage. The dual ports share one 20W budget, so two demanding devices at once means two slower feeds. And each cube has two USB C ports only, so anyone with older Lightning-only accessories will still need a USB C cable to use it.
Pros and Cons
Pros:
- Two cubes in the pack cover multiple rooms in one purchase
- Dual USB C ports charge two devices from a single outlet
- 20W single port output supports iPhone and Samsung fast charging
- Compact profile clears adjacent sockets on a strip
- Runs warm rather than hot under sustained load
- Firm cable grip with no port wobble
Cons:
- 20W ceiling means no laptop or large tablet fast charging
- Both ports share a single 20W budget
- USB C only, so Lightning cables still need a USB C end
How It Compares
The main decision in wall chargers is power, and the 20W cube stacks up against a 30W single port adapter in a clear way. The table below lines up the two.
| Feature | 20W Dual Port Cube | 30W Single Port Adapter |
|---|---|---|
| Total output | 20W shared | 30W on one port |
| Outputs | Two USB C ports | One USB C port |
| iPhone fast charge | Full 20W rate | Full rate, capped by phone |
| iPad fast charge | Moderate rate | Faster full rate |
| Laptop use | Not supported | Small laptops only |
| Best for | Phones, earbuds, bedside | Single demanding device |
If you charge phones and earbuds in several rooms, the two pack of 20W cubes wins on value and convenience. If you have one device that genuinely needs 30W or more, the larger single port adapter is the better fit. Most households live comfortably on the 20W side of that line.
Who Should Buy
Buy this two pack if you keep phones charging in more than one room, if your family runs multiple handsets and earbuds, or if you travel and want a spare cube that packs flat. It is also a sensible replacement for the old 5W bricks that still follow many iPhones around, because the jump in charging speed is immediate and obvious.
Skip it if you need to fast charge a tablet or a compact laptop, because the 20W ceiling will leave you waiting. For phones, earbuds, and everyday topping up, this pair quietly solves the charging drawer problem. You can check the current price of the 2 pack 20W USB C charger on Amazon when you are ready.
How We Test
I used both cubes over several weeks in a home setup, charging an iPhone 14, a Samsung Galaxy, wireless earbuds, and a tablet, and I logged the battery percentage at set intervals to confirm the charging curve. I ran one cube with a single device and then repeated the session with both ports occupied to see how the power split.
I did not measure charging power with a USB meter, so the percentages are the practical evidence rather than lab numbers, and I used standard USB C cables rather than testing the adapter across every cable on the market. For a deeper look at how USB Power Delivery works and what wattage your devices actually need, The Verge has a clear explainer on USB C and power delivery standards that is worth a read. The 2 pack 20W charger block listing on Amazon shows the current price and full specs.
Questions People Ask
How fast does a 20W dual port USB C charger charge an iPhone?
A 20W USB C charger supports fast charging on recent iPhones, reaching roughly 50 percent battery in about 30 minutes on a single port when the cable and phone cooperate.
Will a 20W charger block damage an older phone?
No, the adapter negotiates with the device and only delivers the power the phone requests, so an older iPhone or Samsung model charges safely at its own rate.
Can the two ports charge a phone and a tablet at the same time?
Yes, the dual port design splits its 20W total across both outputs, so a phone and a tablet both charge at once, though the tablet gets a slower feed than it would alone.
Is a 20W power adapter enough for an iPad?
A 20W adapter charges most iPads at a solid rate for daily use, but an iPad Pro or a larger Air model charges faster on a 30W or higher adapter.
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