Demand Switches are very cool https://gigahertz-solutions.com/Demand-Switch
nostr:npub16guycjkxy04e79dwfjejaeafkqlqyq5q94f0yw2l9m50vse32x4qsyulsy , nostr:npub13mypvc3nzgmh8x4l824fwyceldt4ncw3mkf2ruajkrxy45sze20qclzmj7 check this out
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Gighertz solutions makes cool tech. Love it