Its used for Mesh.You enable it,and then turn on Mesh.If your a beginner,then you should wait a little bit.
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Remote sensor connections are only if you have a WeDo board or a PicoBoard or something, basically a real, physical, tangible board. They contain switches and levers and stuff that you can flip in real life, like a light switch. If you don't have one, you don't need to worry about it.
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