For a MacBook (probably for other devices as well), it's best to look for another device if you're going to use ALL ports. This misunderstanding is not worth buying. I bought a new sealed docking station on ebay. I regret that it is not in a normal store, otherwise I would have passed it. They were not in normal stores, apparently no one wants to get involved with this.
Universal Laptop Docking Station for Windows and Mac - Plugable USB 3.0 Dual DisplayPort 4K Monitor with Gigabit Ethernet, Audio, and 6 USB Ports
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11 Review