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The third port is where you connect the power cord. The industry is heading toward UBC-C (thunderbolt) only which can be configured as a multiple type port using an adapter. Apple is currently putting ONLY 1 or 2 USB-C ports in all their computers. This is the industry stardard now to reduce size, weight, and cost. It’s really all you need.
Sorry, there was a problem. Please try again later.Model number 81C3000LUS, has one standard USB 3.0 port, one USB-c port and one Thunderbolt 3.1 port.
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