Have you had any occasion to pass this through airport security?
Using what he called the "magnetic resonance" of the Earth, Tesla indeed was experimenting with generating so-called free energy, and also transmitting it via microwaves at his lab in Colorado. Too bad he was was so paranoid and secretive about it, and most of the techniques and practical knowledge died with him. He was justified in being paranoid, though, as he made so many enemies in the nascent electrical power-generating industry who sought to paint him as a lunatic.
Dude. The Earth's rotation on its axis while receiving energy in the form of emf and IF is the source of the energy. This is not a perpetual motion machine. It will run down, eventually, in a couple billion years.
"Awesome!" - fake oxyclean available at Dollar Tree = $1.00 for 1lb.. Chemically the same.