If it is unpowered, why does a button need to be pressed for it to work? Shouldn't just wearing it make it work?
Because in science fiction a power suit is supposed to read your muscle nerve signals to sync your movement with the suit. But this is very hard in practice, in theory you could connect a device on the spine to read the signals more efficiently, since all nerves extend from here.
Similar to how a prosthetic implant works nowadays, but much more advanced.
What you're describing sounds powered, the article says it is unpowered. Those who run with artificial legs don't need to turn on a switch.
Then it is not much of a power suit.
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