To be honest we don't really need these keys but since Steve Jobs said you don't have connectors we have to buy them! And if you need to buy a key, that's very good! It's powered so you only have to plug in one port of your Macbook (I only have an Air with 2 USB ports, that's important!) and it has tons of ports, even a VGA port! Seriously, who needs a VGA port! But it also has important ones like Ethernet, USB 2.0 3.0, HDMI (4k @ 30Hz) and micro and SD card slots. So many features, you'll never miss the right connection.
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