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Q1. Will the Alu case affect the WIFI?
A: There is nothing reliable than wired Ethernet, so it's better to use it. As our test, 2.4G WIFI AP was usable. But different Raspberry Pi individuals have different degrees of WIFI interference. As well as aluminum alloy case will interfere with pi 4’s WIFI to a certain extent. So it is strongly recommend to use Ethernet or 5G AP. You can refer to video test of 5G WIFI AP: https://youtu.be/LKJVIBQFYXs