Smartlinx Thunderbolt 4 Dock, 21-in-1 Dual 4K 60Hz Docking Station

What is the Smartlinx SL-019 Thunderbolt 4 Dock?

The Smartlinx SL-019 is a Thunderbolt 4 docking station. It turns one laptop port into 21 connections.A docking station sits on the desk and stays plugged in. Monitors, network cable, keyboard, mouse, headset and power all connect to the dock instead of the laptop. The laptop then joins the whole desk with one cable.The SL-019 stands upright in an aluminium case. Ports are split across two panels. The front panel holds the connections you change often, such as card readers and headsets. The rear panel holds the ones you leave plugged in, such as monitors, Ethernet and power.

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Specifications

Attribute	Value
Model	SL-019
Product type	Thunderbolt 4 docking station
Brand	Smartlinx
Host interface	Thunderbolt 4, 40 Gbps
Total ports	21
Maximum external monitors	2
Maximum resolution	4K at 60Hz per monitor
Video outputs	HDMI ×1, Thunderbolt 4 ×2
DisplayPort output	None
Thunderbolt 4 downstream ports	2, at 40 Gbps each
USB-C ports	4, at 10 Gbps each
USB-A 3.2 ports	2, at 10 Gbps each
USB-A 2.0 ports	2, at 480 Mbps each
Total USB ports	8
Ethernet	RJ45, 100 / 1000 / 2500 Mbps
Ethernet standard	IEEE 802.3bz (2.5GBASE-T)
SD card reader	SD 4.0
microSD card reader	microSD 4.0
Audio connections	3.5mm headset, 3.5mm mic input, 3.5mm audio output
Power adapter	150W, 20V / 7.5A
Power input connector	DC barrel, 20V
Laptop charging	Up to 90W, 20V / 4.5A
Fast-charging port	Up to 30W USB Power Delivery
Thunderbolt port power	Up to 15W per port, 5V / 3A
USB-C data port power	Up to 5W per port, 5V / 0.9A
Downstream power budget	60W total
Power switch	Yes
Case material	Aluminium
Orientation	Vertical
Minimum host processor	8th Generation Intel Core or newer
Operating systems	Windows 11, Windows 10, macOS
Driver installation	Not required
Warranty	12 months
Returns	30 days

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Features

Connectivity
Total ports	21 in one dock
Host connection	40 Gbps Thunderbolt 4
Thunderbolt 4 downstream	2 ports, 40 Gbps each
USB-C	4 ports at 10 Gbps
USB-A	2 ports at 10 Gbps, 2 ports at 480 Mbps
Port layout	Front panel for daily connections, rear panel for permanent ones
Display
External monitors	Two at 4K 60Hz
HDMI	1 port, up to 4K 60Hz
Thunderbolt video	Both downstream ports carry video
Display modes	Mirror and extend
Daisy-chaining	Supported where the monitor allows it
DisplayPort socket	None — DisplayPort monitors connect through Thunderbolt
Power
Power adapter	150W, 20V / 7.5A
Laptop charging	Up to 90W, 20V / 4.5A
Fast-charging port	Up to 30W USB Power Delivery
Thunderbolt 4 ports	15W each, 5V / 3A
USB-C data ports	5W each, 5V / 0.9A
Power button	Cuts every peripheral without unplugging the dock
Network
Ethernet	2.5 Gigabit, full-size RJ45
Speeds	100, 1000 or 2500 Mbps, selected automatically
Standard	IEEE 802.3bz (2.5GBASE-T)
Storage and media
SD card reader	SD 4.0, full-size
microSD card reader	microSD 4.0
Simultaneous use	Both slots read at the same time
External drives	40 Gbps over Thunderbolt, 10 Gbps over USB
Audio
Headset jack	3.5mm combo, front panel
Microphone input	3.5mm, rear panel, separate
Audio output	3.5mm, rear panel, separate
Build and support
Case	Aluminium, vertical stand
Minimum host processor	8th Generation Intel Core or newer
Driver installation	Not required on Windows 11, Windows 10 or macOS
Warranty	12 months

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Compatibility 

The SL-019 connects to laptops with a Thunderbolt 4, Thunderbolt 3 or USB4 port, covering 8th Generation Intel Core processors and newer. It also connects to plain USB-C ports, with fewer functions. What works depends on the laptop, not the dock. The sections below cover each case.

Which Windows laptops work with the Smartlinx SL-019?

It works with Windows laptops from 8th Generation Intel Core onward. The port type on the laptop sets which mode it runs in.

Intel generation	Years	Laptop port	Dock speed	Monitors
8th, 9th, 10th Gen	2017–2020	Thunderbolt 3	40 Gbps	2
11th Gen and newer	2020 onward	Thunderbolt 4	40 Gbps	2
Core Ultra	2023 onward	Thunderbolt 4	40 Gbps	2

Thunderbolt 4 arrived with 11th Generation Intel Core processors. Laptops from 8th to 10th Generation carry Thunderbolt 3, which runs the dock at the same 40 Gbps with two monitors and full Ethernet.

Business ranges carrying Thunderbolt 3 or Thunderbolt 4 include Dell Latitude, Dell XPS, Dell Precision, Lenovo ThinkPad X1, Lenovo ThinkPad T-series, Lenovo ThinkPad P-series, HP EliteBook, HP ZBook, HP Spectre, ASUS ZenBook, Acer Swift and Framework Laptop.

AMD laptops carry USB4 more often than Thunderbolt 4. Ryzen 6000, 7000 and 8000 series laptops usually offer USB4 at 40 Gbps. Check the port symbol: a lightning bolt means Thunderbolt, a plain USB symbol means USB4 or USB-C. Laptops with 7th Generation Intel processors or older run the dock with limited functions.

Which Macs work with the Smartlinx SL-019?

It works with Intel Macs and Apple Silicon Macs that have a Thunderbolt port. The number of monitors a Mac drives is set by the Mac’s chip, not by the dock.

Mac processor	Monitors through the SL-019
M1	1
M2	1
M3	1 with the lid open, 2 with the lid closed
M4	2
M1 Pro, M2 Pro, M3 Pro, M4 Pro	2
M1 Max, M2 Max, M3 Max, M4 Max	2
M1 Ultra, M2 Ultra, M3 Ultra	2
Intel Mac with Thunderbolt 3 (2016–2020)	2

Three points matter here.

A MacBook Air or MacBook Pro with an M1 or M2 chip drives one external monitor. Mirroring the built-in screen to that monitor still counts as one external monitor. Connecting a second monitor leaves it black. This is a limit inside the Mac and it applies to every Thunderbolt dock at any price.

An M3 base chip drives a second monitor only with the laptop lid shut, on macOS Sonoma or later. Open the lid and the Mac returns to one monitor.Macs with Pro, Max and Ultra chips drive two monitors in mirroring and extending modes, the same as Windows.

macOS does not support Multi-Stream Transport. A dock cannot split one video signal into two monitors on a Mac. Each monitor needs its own signal from the chip. That is why the chip decides the outcome, not the dock.

To check which chip a Mac has: Apple menu > About This Mac.

Everything else works on every Mac listed above Ethernet, all eight USB ports, both card readers, all three audio jacks and 90W charging.

Does the Smartlinx SL-019 work with USB-C and USB4 laptops?

Yes, with fewer functions on plain USB-C.

Laptop port	Speed	Monitors	Ethernet and Thunderbolt ports	Charging
Thunderbolt 4	40 Gbps	2	Yes	90W
Thunderbolt 3	40 Gbps	2	Yes	90W
USB4 40 Gbps	40 Gbps	1 or 2, depends on the laptop	Depends on the laptop	90W
USB-C with DisplayPort Alt Mode	10 Gbps	1	No	90W
USB-C, data only	10 Gbps	0	No	90W

PCIe tunnelling is the part that decides. Thunderbolt 4 and Thunderbolt 3 always include it. USB4 makes it optional. Plain USB-C does not have it. A laptop without PCIe tunnelling does not run the dock’s Ethernet chip, its card readers or its downstream Thunderbolt ports. This explains almost every case where a dock seems half-broken on an AMD laptop.

Which monitors work with the Smartlinx SL-019?

Monitor input	How it connects	Cable needed
HDMI	Straight into the HDMI port	HDMI cable
USB-C	Into a Thunderbolt 4 port	USB-C cable
Thunderbolt	Into a Thunderbolt 4 port	Thunderbolt cable
DisplayPort	Into a Thunderbolt 4 port	USB-C to DisplayPort cable
VGA or DVI	Into the HDMI port	HDMI to VGA or HDMI to DVI adapter

The SL-019 has no DisplayPort socket. DisplayPort monitors connect through a Thunderbolt 4 port using a USB-C to DisplayPort cable. Monitors supporting daisy-chaining connect to each other through the Thunderbolt ports, which frees a port on the dock.

Which peripherals work with the Smartlinx SL-019?

Peripheral	Best port	Why
External SSD or NVMe drive	Thunderbolt 4, or USB 10 Gbps	Highest transfer speed
Keyboard and mouse	USB-A 2.0	480 Mbps is enough, keeps fast ports free
Webcam	USB-A 10 Gbps or USB-C	Steady bandwidth for 1080p and 4K
Printer or scanner	USB-A 2.0	Low bandwidth need
USB microphone	USB-A 10 Gbps or USB-C	Steady bandwidth
Analogue microphone	3.5mm mic input	Dedicated input, separate from output
Powered speakers	3.5mm audio output	Dedicated output, separate from input
Headset	3.5mm front jack	Combined mic and headphone
Phone or tablet	Fast-charging USB-C port	Up to 30W charging
Camera SD card	SD 4.0 slot	No adapter needed
Drone or action camera card	microSD 4.0 slot	No adapter needed

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How much power does the Smartlinx SL-019 deliver?

The SL-019 takes 150W from its adapter at 20V and 7.5A. It sends up to 90W to the laptop at 20V and 4.5A.

The other 60W runs the downstream ports.

Power path	Maximum	Rating
Adapter input	150W	20V / 7.5A
Laptop charging	90W	20V / 4.5A
Fast-charging USB-C port	30W	USB Power Delivery
Thunderbolt 4 ports, each	15W	5V / 3A
USB-C data ports, each	5W	5V / 0.9A
Downstream budget	60W	150W − 90W

Laptops that need more than 90W charge slowly under heavy load. A 16-inch MacBook Pro ships with a 140W adapter. Most mobile workstations ship with 130W. Under heavy processor and graphics work those machines draw more than this dock gives. They still charge normally when idle or under light use.

Laptops shipping with a 65W or 90W adapter charge at full speed all the time. That covers most 13-inch and 14-inch business laptops, including MacBook Air, Dell Latitude and Lenovo ThinkPad X-series.

The fast-charging port negotiates its rate with the attached device. Phones, tablets and power banks supporting USB Power Delivery draw up to 30W. Devices without Power Delivery draw less.

The numbers above are per-port maximums. Pulling the maximum from every port at once goes past the 60W downstream budget, and the dock lowers output to stay inside it.

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What ports does the Smartlinx SL-019 have?

Front panel — 10 ports

Port	Quantity	Specification
USB-C	2	10 Gbps, 5W
USB-C fast-charging	1	10 Gbps, up to 30W Power Delivery
USB-A	2	10 Gbps
USB-A 2.0	2	480 Mbps
SD card reader	1	SD 4.0
microSD card reader	1	microSD 4.0
Headset jack	1	3.5mm combo

Rear panel — 11 ports

Port	Quantity	Specification
Thunderbolt 4, downstream	2	40 Gbps, 15W each
Host uplink	1	40 Gbps
HDMI	1	4K 60Hz
USB-C	1	10 Gbps, 5W
USB-A	2	10 Gbps
Ethernet, RJ45	1	100 / 1000 / 2500 Mbps
Microphone input	1	3.5mm
Audio output	1	3.5mm
DC power input	1	20V

Also on the case: power on/off button.

About the Ethernet port. It picks 100, 1000 or 2500 Mbps automatically, following the IEEE 802.3bz standard. Reaching 2500 Mbps needs a 2.5 Gigabit switch or router and Cat 5e cable or better.

About the card readers. Both follow SD Association standards SD 4.0 for full-size cards, microSD 4.0 for the small format. Both read at the same time.

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How does the Smartlinx SL-019 work?

A Thunderbolt cable carries data, video and power together. The dock separates the three inside its case and sends each one where it belongs.

It runs in four steps.

1. Power comes in through the DC socket at 20V and 7.5A. That gives the dock 150W to work with.
2. The dock sends up to 90W back to the laptop at 20V and 4.5A. The laptop’s own charger stays in the bag.
3. Video travels through the same cable using DisplayPort tunnelling. The dock splits it into two signals — one to the HDMI port, one to the Thunderbolt 4 ports.
4. Everything else travels through PCIe tunnelling. This runs the Ethernet chip, the card readers and the USB ports.

Thunderbolt 4 and Thunderbolt 3 both include these tunnelling types as standard. That is why the dock runs fully on either. The USB4 standard makes both optional. Which is why a USB4 laptop behaves differently depending on how its maker built it.

No drivers are needed on Windows 11, Windows 10 or macOS. Plug it in and the system finds everything within seconds.

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Frequently asked questions

What does the Smartlinx SL-019 not do?

• No DisplayPort socket. Video goes out through HDMI and Thunderbolt 4 only.
• No third monitor. Two are the ceiling.
• No internal drive bay. Drives connect externally through the USB or Thunderbolt ports.
• No second monitor on M1 and M2 Macs. Base Apple Silicon chips drive one, whatever the dock offers.
• No charging above 90W. Laptops with 130W or 140W chargers charge slowly under heavy load.
• No Ethernet or downstream Thunderbolt on plain USB-C laptops without PCIe tunnelling.
• No driver library, firmware portal or user forum. A PDF manual is published, and support runs through Amazon and info@smartlinx.pro.

What problem does the Smartlinx SL-019 solve?

Most laptops built after 2020 have two to four ports. A working desk needs ten or more.

That gap creates three problems.

• Too many cables. Plugging a laptop back into monitors, network, keyboard, mouse, headset and power takes six separate connections.
• Missing port types. New laptops drop Ethernet, HDMI, USB-A and card readers. Each one then needs its own adapter.
• Shared bandwidth. Adapters chained onto one USB-C port split the bandwidth between them. Monitors drop refresh rate and file transfers slow down.

It fixes all three with one cable carrying 40 Gbps of data, two monitor signals, network traffic and 90W of power at once.

Does the Smartlinx SL-019 work with a MacBook Air?

Yes and the number of monitors depends on the chip. A MacBook Air with an M1 or M2 chip drives one external monitor. Mirroring the built-in screen to that monitor still counts as one. A MacBook Air with an M3 chip drives a second monitor with the lid shut, on macOS Sonoma or later. A MacBook Air with an M4 chip drives two external monitors with the lid open or shut. Everything else works on all of them 90W charging, 2.5 Gigabit Ethernet, all eight USB ports, both card readers and all three audio jacks. If you plug two monitors into an M1 or M2 MacBook Air, the second one stays black. That is a limit inside the Mac, not the dock.

Does the Smartlinx SL-019 work with older laptops?

Yes. It runs at full 40 Gbps on laptops from 8th Generation Intel Core onward, which covers business laptops going back to 2017. Laptops from 8th to 10th Generation carry Thunderbolt 3, and the dock runs two monitors, Ethernet, all USB ports and 90W charging on those machines. Laptops from 11th Generation onward carry Thunderbolt 4 and behave identically. Laptops with 7th Generation processors or older run the dock with limited functions. Many Thunderbolt 4 docks require 11th Generation or newer, so this wider range is worth checking against other models.

How many monitors does the Smartlinx support?

This supports two external monitors at 4K 60Hz, through one HDMI port and two Thunderbolt 4 ports. Two things have to be true: the laptop needs a Thunderbolt 4 or Thunderbolt 3 port and the laptop’s processor needs to support two external monitors. Windows laptops from 8th Generation Intel Core onward meet both, in mirroring and extending modes. Macs meet the second at the Pro, Max and Ultra tiers and at the base tier only on M4 chips and on M3 chips with the lid shut. There is no DisplayPort socket, so DisplayPort monitors connect through a Thunderbolt port with a USB-C to DisplayPort cable.

How fast does the Smartlinx charge a laptop?

The product sends up to 90W to the laptop, taken from a 150W adapter rated 20V and 7.5A. Laptops shipping with a 65W or 90W charger get full speed all the time. Laptops shipping with 130W or 140W chargers the 16-inch MacBook Pro and most mobile workstations charge normally when idle and charge slowly under heavy processor and graphics load. The remaining 60W runs the downstream ports: up to 30W on the dedicated fast charging port, up to 15W on each Thunderbolt 4 port and up to 5W on each USB-C data port.

Can the Smartlinx fast-charge a phone or tablet?

Yes. The SL-019 has a dedicated USB-C fast-charging port supporting USB Power Delivery at up to 30W. The port negotiates its rate with the attached device. so a phone or tablet that supports Power Delivery draws the highest rate it accepts, up to 30W. Devices without Power Delivery draw less. This port also carries data at 10 Gbps. So a phone charges and transfers files at the same time. The three other USB-C ports supply up to 5W each, which suits low-draw accessories rather than fast charging.

Does the Smartlinx work with a laptop that has USB-C but not Thunderbolt?

Yes, with fewer functions. Data runs at 10 Gbps instead of 40 Gbps. One monitor connects as long as the USB-C port supports DisplayPort Alt Mode. Ethernet and the two downstream Thunderbolt ports need PCIe tunnelling, which plain USB-C does not have, so those stay off. Charging still works at up to 90W. Laptops with 8th, 9th or 10th Generation Intel processors have Thunderbolt 3 rather than plain USB-C, . . And those run the dock at full 40 Gbps with two monitors and working Ethernet.

How many USB ports does the Smartlinx have?

The product has eight USB ports across both panels at three speeds. Four USB-C ports run at 10 Gbps three supply up to 5W each, and one is the dedicated fast-charging port at up to 30W. Two USB-A ports run at 10 Gbps. Two more USB-A ports run at 480 Mbps, which is fine for keyboards, mice and dongles. The two Thunderbolt 4 ports also take USB-C plugs. So six connectors in total accept a USB-C device. Put external SSDs and anything else needing steady speed on the 10 Gbps or Thunderbolt ports.

Does the Smartlinx have 2.5 Gigabit Ethernet?

Yes. The RJ45 port runs at 100, 1000 or 2500 Mbps and picks the rate automatically with your switch or router. Reaching 2500 Mbps needs a switch or router supporting 2.5 Gigabit Ethernet, plus Cat 5e cable or better. On a 1 Gigabit network it runs at 1000 Mbps. Ethernet needs PCIe tunnelling from the laptop. So it works on Thunderbolt 4 and Thunderbolt 3 laptops and on USB4 laptops that include PCIe tunnelling. Plain USB-C laptops do not run the Ethernet chip.

Can this product read SD cards?

Yes. This has an SD 4.0 reader and a microSD 4.0 reader. Both on the front panel, so no separate card reader is needed. They sit next to the headset jack and the USB-C ports, within easy reach when seated. Photographers and videographers moving files from full-size SD cards and microSD cards use both slots at once, without swapping adapters. Card readers are uncommon on docking stations below $250, and docks that include them usually cost more.

How many monitors does the Smartlinx SL-019 support?

It supports two external monitors at 4K 60Hz. Video goes out through one HDMI port and two Thunderbolt 4 ports. Two things have to be true.

1. The laptop has a Thunderbolt 4 or Thunderbolt 3 port.
2. The laptop’s processor supports two external monitors.

Windows laptops from 8th Generation Intel Core onward meet both. Macs meet the second at the Pro, Max and Ultra tiers, and at the base tier only on M4 chips and on M3 chips with the lid shut.

Where is the Smartlinx SL-019 used?

Six settings account for most Thunderbolt dock use.

• Hybrid and hot-desking offices — one dock per desk, any laptop connects, nothing to set up per person
• Photography and video work — camera cards read straight from the dock, external SSDs run at 10 Gbps during ingest
• Software development — one monitor for code, one for documentation, wired Ethernet for repository and container pulls
• Finance and trading — two monitors for market data and orders, wired network for steady latency
• Architecture and design — one monitor for drawing, one for reference, Thunderbolt ports for external drives
• Remote meetings and recording — a separate mic input and speaker output instead of one shared jack

What should buyers check before ordering?

Five checks decide whether any dock fits a desk.

1. Check the laptop’s port. Look for Thunderbolt 4, Thunderbolt 3 or USB4. A lightning bolt next to the port means Thunderbolt.
2. Check the chip’s monitor limit. On a Mac, open About This Mac. Base M1, M2 and M3 chips drive one monitor.
3. Check the laptop’s charger rating. Compare it against 90W. A 130W or 140W laptop charges slowly under heavy load.
4. Count the peripherals by plug type. Add up USB-A, USB-C, HDMI, RJ45 and 3.5mm, then match against the port tables above.
5. Check the network speed available. 2.5 Gigabit Ethernet needs a 2.5 Gigabit switch or router. A 1 Gigabit network runs at 1000 Mbps.

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