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Rectangular black docking station with front eject button and multiple rear ports

Lenovo

Lenovo 4337-10U ThinkPad Mini Dock Series 3 docking station

SKU CH-7EFA-H657D MPN 4337-10U

Connects compatible ThinkPad laptops to six USB 2.0 ports, DVI-D, VGA, DisplayPort, Ethernet and audio, supporting dual external monitors

  • Port detailsSix USB 2.0 ports 1 x Single-Link DVI-D 1 x D-Sub 1 x Displa
  • Measurements14 in × 7.8 in × 2.2 in
  • Compatible withThinkPad L412, L420, L512, L520, T400s, T410, T410i, T410s,
  • Key featuresLeft corner alignment for easy system attachment Convenient
  • Product weight2 lb (0.91 kg)
  • Connect two external monitors with DVI-D, DisplayPort or VGA outputs
  • Six USB 2.0 ports keep peripherals connected without extra hubs
  • Wired RJ-45 Ethernet adds reliable network access at the desk
  • Left-corner alignment and eject button simplify laptop docking and removal
  • Integrated key lock and cable slot secure the ThinkPad physically

ThinkPad Mini Dock Series 3

This Lenovo 4337-10U docking station expands connectivity for compatible ThinkPad models including the T420, T520, X220 and L-series laptops. It adds six USB 2.0 ports, wired Ethernet, audio jacks and three video outputs to a single desk connection. The unit is designed for professionals who need a permanent desk setup with legacy monitor support.

Left-corner alignment and eject button

The dock uses a left-corner alignment mechanism so the laptop slides on from the side and locks into place. A convenient eject button releases the system in one step without forcing the connector. No software driver installation is required for the port replication itself; video output simply works when the laptop is seated correctly.

Dual-monitor limit and cable choice

Only two of the three video ports can be active at once; attaching two external monitors disables the ThinkPad's own display. The Single-Link DVI-D port does not accept a DVI-to-VGA adapter, and DisplayPort cables reduce the maximum resolution to 1920 x 1200. Verify that your monitors have native DVI-D, VGA or DisplayPort inputs and that your ThinkPad model appears in the supported list before ordering.

How it compares

Measured against everything we stock in USB-C & Laptop Docking Stations, at today’s prices. Recalculated every night.

Price $39.99
Cheaper than about 80% of the 1,971 comparable items (median $81.99).

Specifications

Product
Brand nameLenovo
Model name4337-10U
Ports & slots
Port detailsSix USB 2.0 ports
1 x Single-Link DVI-D
1 x D-Sub
1 x DisplayPort
1 x Analog microphone in
1 x Headphone out
RJ-45 Ethernet port
Size & build
Measurements14 in × 7.8 in × 2.2 in
Product weight2 lb (0.91 kg)
Shipping weight2.27 kg
Package size559 × 457 × 152 mm
Compatibility
Compatible withThinkPad L412, L420, L512, L520, T400s, T410, T410i, T410s, T410si, T420, T420s, T510, T510i, T520 Dual Core models, X220

Questions about this item

How can I confirm the ThinkPad Mini Dock Series 3 is working after connecting my T420?

Connect power, attach the laptop via the left-corner alignment, and press the eject button to verify the one-step removal works. Check that two of the three video ports — DVI-D, D-Sub, or DisplayPort — drive external monitors while the built-in screen disables, and test the RJ-45 Ethernet and six USB 2.0 ports for data.

What comes in the box with the 4337-10U and what must I buy separately?

The dock includes the unit with six USB 2.0 ports, Single-Link DVI-D, D-Sub, DisplayPort, analog microphone in, headphone out, and RJ-45 Ethernet. You must supply compatible ThinkPad models such as T410, T420, T520, X220 or listed L-series, plus any monitor cables and a power adapter.

Which video port combination should I choose for dual monitors on a T510?

Use any two of the three ports — DVI-D, D-Sub, or DisplayPort — simultaneously. DVI-D and D-Sub each support 1920 x 1200; DisplayPort supports 2560 x 1600 but drops to 1920 x 1200 with DisplayPort cables. The DVI-D port does not accept a DVI-to-VGA adapter.

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