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This MacBook Pro has only two USB-C ports. Since one is used to charge the laptop (the monitor can't charge the laptop), there is only one available port to plug a monitor.

Is it possible to connect two external monitors, for example with a hub? If so, can we have 4K resolution for at least one monitor?

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To get two external monitors on your 13" MacBook Pro, you need

Both displays can support 4K at 60Hz. From Apple's technical specifications page:

Video Support

Simultaneously supports full native resolution on the built-in display at millions of colors and:

  • One display with 5120-by-2880 resolution at 60Hz at over a billion colors

  • Up to two displays with 4096-by-2304 resolution at 60Hz at millions of colors

  • Up to two displays with 3840-by-2160 resolution at 60Hz at over a billion colors

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    This answer allows to connect one external monitor only. We still don't know when using a hub, if it impacts the maximum resolution (2 monitors into one USB-C channel).
    – Kwadz
    Apr 18 '18 at 13:35
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    @Kwadz. Incorrect. You have two ports. One gets the hub with power pass through and the second port gets the cable. To connect two monitors you need to use both ports.
    – Allan
    Apr 18 '18 at 13:37
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    Got it, so you mean we use one USB-C from the laptop to connect a first monitor and the HDMI of the hub to connect a second monitor. I imagined both monitors connected with Display port, that's why I didn't get you first time. Anyway by using the two ports of the MacBook the max resolution won't be affected. Thanks.
    – Kwadz
    Apr 18 '18 at 15:08
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Given that a pair of monitors are not engineered to 'daisy chain' (see below), you must use an adapter. There are many options for purchase, some can provide a wide array of I/O options for different cable types, and some that simply output to 2 HDMI connections (and allow for 4k signal). Assuming your monitors have HDMI inputs, that would be your more basic solution. You would want to do a product search for "thunderbolt 3 to dual HDMI adapter".

If in the future you get monitors with thunderbolt ports, you would be able to use them for daisy chaining a spectrum of configurations, as shown in this infographic.

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