So don't worry about using Lightning for small devices which don't transmit much data, or that need to be light enough to clip to your ear. It would be a complete waste to have a Lightning keyboard, for example. But to do this it uses some big chips on the circuit board, requires some very expensive cables, and uses power like you wouldn't believe, even for one tiny message. So it can do things like "Here is a frame for a 2048 x 768 display at 768 bits of colour per pixel" or "Here is the next 4 megabytes of your file". It's designed for transmitting huge amounts of data very fast. Lightning/Thunderbolt is a very high-power system. So it's very good at transmitting a lot of very short messages like "they pressed the 't' key" or "your current GPS position is 1234,5678". In the first port you use the dongle (the one that has USB/HDMI/USB-C) - you directly connect the other monitor to the hdmi on the dongle. you leave one of the display ports in the dock, connect the DOCK USB-C to the macbook second port. It's designed on purpose for small devices with batteries in and a lot of its cleverness is its ability to listen for and broadcast using a tiny little chipset and very little battery power. this is a little delayed but I figured out a solution. You would want them all to use Bluetooth. None of those things would use Lightning.
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